diff --git a/extras/videoDrivers/SDL2/VideoSDL2.cpp b/extras/videoDrivers/SDL2/VideoSDL2.cpp
index afd519c10..492440e24 100644
--- a/extras/videoDrivers/SDL2/VideoSDL2.cpp
+++ b/extras/videoDrivers/SDL2/VideoSDL2.cpp
@@ -14,6 +14,7 @@
 #include <s25util/utf8.h>
 #include <boost/nowide/iostream.hpp>
 #include <SDL.h>
+#include <SDL_stdinc.h>
 #include <algorithm>
 
 #ifdef _WIN32
@@ -91,7 +92,7 @@ void VideoSDL2::UpdateCurrentSizes()
     SetNewSize(VideoMode(w, h), Extent(w2, h2));
 }
 
-bool VideoSDL2::CreateScreen(const std::string& title, const VideoMode& size, bool fullscreen)
+bool VideoSDL2::CreateScreen(const std::string& title, const VideoMode& size, WindowMode windowMode, bool fullscreen)
 {
     if(!initialized)
         return false;
@@ -116,15 +117,18 @@ bool VideoSDL2::CreateScreen(const std::string& title, const VideoMode& size, bo
     int wndPos = SDL_WINDOWPOS_CENTERED;
 
     const auto requestedSize = fullscreen ? FindClosestVideoMode(size) : size;
+    unsigned commonFlags = SDL_WINDOW_OPENGL;
+    unsigned fullscreenFlags = (fullscreen ? SDL_WINDOW_FULLSCREEN : 0);
+    unsigned windowFlags = (windowMode == WindowMode::Resizable ? SDL_WINDOW_RESIZABLE : 0);
 
     window = SDL_CreateWindow(title.c_str(), wndPos, wndPos, requestedSize.width, requestedSize.height,
-                              SDL_WINDOW_OPENGL | (fullscreen ? SDL_WINDOW_FULLSCREEN : SDL_WINDOW_RESIZABLE));
+                              commonFlags | fullscreenFlags | windowFlags);
 
     // Fallback to non-fullscreen
     if(!window && fullscreen)
     {
         window = SDL_CreateWindow(title.c_str(), wndPos, wndPos, requestedSize.width, requestedSize.height,
-                                  SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
+                                  commonFlags | windowFlags);
     }
 
     if(!window)
@@ -133,7 +137,9 @@ bool VideoSDL2::CreateScreen(const std::string& title, const VideoMode& size, bo
         return false;
     }
 
-    isFullscreen_ = (SDL_GetWindowFlags(window) & SDL_WINDOW_FULLSCREEN) != 0;
+    const auto flags = SDL_GetWindowFlags(window);
+    isFullscreen_ = (flags & SDL_WINDOW_FULLSCREEN) != 0;
+    windowMode_ = ((flags & SDL_WINDOW_RESIZABLE) != 0 ? WindowMode::Resizable : WindowMode::NonResizable);
     UpdateCurrentSizes();
 
     if(!isFullscreen_)
@@ -161,7 +167,7 @@ bool VideoSDL2::CreateScreen(const std::string& title, const VideoMode& size, bo
     return true;
 }
 
-bool VideoSDL2::ResizeScreen(const VideoMode& newSize, bool fullscreen)
+bool VideoSDL2::ResizeScreen(const VideoMode& newSize, WindowMode windowMode, bool fullscreen)
 {
     if(!initialized)
         return false;
@@ -172,9 +178,6 @@ bool VideoSDL2::ResizeScreen(const VideoMode& newSize, bool fullscreen)
         isFullscreen_ = (SDL_GetWindowFlags(window) & SDL_WINDOW_FULLSCREEN) != 0;
         if(!isFullscreen_)
         {
-#if SDL_VERSION_ATLEAST(2, 0, 5)
-            SDL_SetWindowResizable(window, SDL_TRUE);
-#endif
             MoveWindowToCenter();
         }
     }
@@ -203,6 +206,17 @@ bool VideoSDL2::ResizeScreen(const VideoMode& newSize, bool fullscreen)
         }
         UpdateCurrentSizes();
     }
+
+    if(windowMode != windowMode_)
+    {
+        if(!isFullscreen_)
+#if SDL_VERSION_ATLEAST(2, 0, 5)
+            SDL_SetWindowResizable(window, static_cast<SDL_bool>(windowMode == WindowMode::Resizable));
+#endif
+        windowMode_ =
+          ((SDL_GetWindowFlags(window) & SDL_WINDOW_RESIZABLE) != 0 ? WindowMode::Resizable : WindowMode::NonResizable);
+    }
+
     return true;
 }
 
diff --git a/extras/videoDrivers/SDL2/VideoSDL2.h b/extras/videoDrivers/SDL2/VideoSDL2.h
index 0a34be639..f16e522ce 100644
--- a/extras/videoDrivers/SDL2/VideoSDL2.h
+++ b/extras/videoDrivers/SDL2/VideoSDL2.h
@@ -24,8 +24,8 @@ class VideoSDL2 final : public VideoDriver
 
     bool Initialize() override;
 
-    bool CreateScreen(const std::string& title, const VideoMode& size, bool fullscreen) override;
-    bool ResizeScreen(const VideoMode& newSize, bool fullscreen) override;
+    bool CreateScreen(const std::string& title, const VideoMode& size, WindowMode windowMode, bool fullscreen) override;
+    bool ResizeScreen(const VideoMode& newSize, WindowMode windowMode, bool fullscreen) override;
 
     void DestroyScreen() override;
 
diff --git a/extras/videoDrivers/WinAPI/WinAPI.cpp b/extras/videoDrivers/WinAPI/WinAPI.cpp
index 8b43cb086..b9bb0615b 100644
--- a/extras/videoDrivers/WinAPI/WinAPI.cpp
+++ b/extras/videoDrivers/WinAPI/WinAPI.cpp
@@ -138,7 +138,8 @@ void VideoWinAPI::CleanUp()
  *  @bug Hardwarecursor ist bei Fenstermodus sichtbar,
  *       Cursor deaktivieren ist fehlerhaft
  */
-bool VideoWinAPI::CreateScreen(const std::string& title, const VideoMode& newSize, bool fullscreen)
+bool VideoWinAPI::CreateScreen(const std::string& title, const VideoMode& newSize, WindowMode /* windowMode */,
+                               bool fullscreen)
 {
     if(!initialized)
         return false;
@@ -174,7 +175,7 @@ bool VideoWinAPI::CreateScreen(const std::string& title, const VideoMode& newSiz
  *
  *  @todo Vollbildmodus ggf. wechseln
  */
-bool VideoWinAPI::ResizeScreen(const VideoMode& newSize, bool fullscreen)
+bool VideoWinAPI::ResizeScreen(const VideoMode& newSize, WindowMode /* windowMode */, bool fullscreen)
 {
     if(!initialized || !isWindowResizable)
         return false;
@@ -253,7 +254,7 @@ RECT VideoWinAPI::CalculateWindowRect(bool fullscreen, VideoMode& size) const
     return wRect;
 }
 
-bool VideoWinAPI::RegisterAndCreateWindow(const std::string& title, const VideoMode& wndSize, bool fullscreen)
+bool VideoWinAPI::RegisterAndCreateWindow(const std::string& title, const VideoMode& wndSize, WindowMode windowMode)
 {
     std::wstring wTitle = boost::nowide::widen(title);
     windowClassName = wTitle.substr(0, wTitle.find(' '));
diff --git a/extras/videoDrivers/WinAPI/WinAPI.h b/extras/videoDrivers/WinAPI/WinAPI.h
index 408e4097e..0e92240b1 100644
--- a/extras/videoDrivers/WinAPI/WinAPI.h
+++ b/extras/videoDrivers/WinAPI/WinAPI.h
@@ -30,10 +30,11 @@ class VideoWinAPI final : public VideoDriver
     bool Initialize() override;
 
     /// Erstellt das Fenster mit entsprechenden Werten.
-    bool CreateScreen(const std::string& title, const VideoMode& newSize, bool fullscreen) override;
+    bool CreateScreen(const std::string& title, const VideoMode& newSize, WindowMode windowMode,
+                      bool fullscreen) override;
 
     /// Erstellt oder verändert das Fenster mit entsprechenden Werten.
-    bool ResizeScreen(const VideoMode& newSize, bool fullscreen) override;
+    bool ResizeScreen(const VideoMode& newSize, WindowMode windowMode, bool fullscreen) override;
 
     /// Schliesst das Fenster.
     void DestroyScreen() override;
diff --git a/libs/driver/include/driver/VideoDriver.h b/libs/driver/include/driver/VideoDriver.h
index 9d2860219..13e97a101 100644
--- a/libs/driver/include/driver/VideoDriver.h
+++ b/libs/driver/include/driver/VideoDriver.h
@@ -30,6 +30,7 @@ class VideoDriver : public IVideoDriver
     VideoMode GetWindowSize() const override final { return windowSize_; }
     Extent GetRenderSize() const override final { return renderSize_; }
     bool IsFullscreen() const override final { return isFullscreen_; }
+    WindowMode GetWindowMode() const override final { return windowMode_; }
 
     /// prüft auf Initialisierung.
     bool IsInitialized() const override final { return initialized; }
@@ -44,6 +45,7 @@ class VideoDriver : public IVideoDriver
     MouseCoords mouse_xy;                 /// Status der Maus.
     std::array<bool, 512> keyboard;       /// Status der Tastatur;
     bool isFullscreen_;                   /// Vollbild an/aus?
+    WindowMode windowMode_;               /// Resizable/non-resizable window?
 private:
     // cached as possibly used often
     VideoMode windowSize_;
diff --git a/libs/driver/include/driver/VideoInterface.h b/libs/driver/include/driver/VideoInterface.h
index 04cf639bb..ae32609ea 100644
--- a/libs/driver/include/driver/VideoInterface.h
+++ b/libs/driver/include/driver/VideoInterface.h
@@ -14,6 +14,12 @@
 /// Function type for loading OpenGL methods
 using OpenGL_Loader_Proc = void* (*)(const char*);
 
+enum class WindowMode
+{
+    Resizable,
+    NonResizable,
+};
+
 class BOOST_SYMBOL_VISIBLE IVideoDriver
 {
 public:
@@ -25,9 +31,10 @@ class BOOST_SYMBOL_VISIBLE IVideoDriver
     virtual bool Initialize() = 0;
 
     /// Erstellt das Fenster mit entsprechenden Werten.
-    virtual bool CreateScreen(const std::string& title, const VideoMode& newSize, bool fullscreen) = 0;
+    virtual bool CreateScreen(const std::string& title, const VideoMode& newSize, WindowMode windowMode,
+                              bool fullscreen) = 0;
 
-    virtual bool ResizeScreen(const VideoMode& newSize, bool fullscreen) = 0;
+    virtual bool ResizeScreen(const VideoMode& newSize, WindowMode windowMode, bool fullscreen) = 0;
 
     /// Schliesst das Fenster.
     virtual void DestroyScreen() = 0;
@@ -62,6 +69,7 @@ class BOOST_SYMBOL_VISIBLE IVideoDriver
     /// Get the size of the render region in pixels
     virtual Extent GetRenderSize() const = 0;
     virtual bool IsFullscreen() const = 0;
+    virtual WindowMode GetWindowMode() const = 0;
 
     /// Get state of the modifier keys
     virtual KeyEvent GetModKeyState() const = 0;
diff --git a/libs/s25main/GameManager.cpp b/libs/s25main/GameManager.cpp
index 6d3cce356..4293a9cba 100644
--- a/libs/s25main/GameManager.cpp
+++ b/libs/s25main/GameManager.cpp
@@ -50,7 +50,7 @@ bool GameManager::Start()
     // Fenster erstellen
     const auto screenSize =
       settings_.video.fullscreen ? settings_.video.fullscreenSize : settings_.video.windowedSize; //-V807
-    if(!videoDriver_.CreateScreen(screenSize, settings_.video.fullscreen))
+    if(!videoDriver_.CreateScreen(screenSize, settings_.video.windowMode, settings_.video.fullscreen))
         return false;
     videoDriver_.setTargetFramerate(settings_.video.framerate);
     videoDriver_.SetMouseWarping(settings_.global.smartCursor);
diff --git a/libs/s25main/Settings.cpp b/libs/s25main/Settings.cpp
index 6b9e7e6c0..a48afeb77 100644
--- a/libs/s25main/Settings.cpp
+++ b/libs/s25main/Settings.cpp
@@ -85,10 +85,12 @@ void Settings::LoadDefaults()
         video.fullscreenSize = VIDEODRIVER.GetWindowSize();
         video.windowedSize = VIDEODRIVER.IsFullscreen() ? VideoMode(800, 600) : video.fullscreenSize;
         video.fullscreen = VIDEODRIVER.IsFullscreen();
+        video.windowMode = VIDEODRIVER.GetWindowMode();
     } else
     {
         video.windowedSize = video.fullscreenSize = VideoMode(800, 600);
         video.fullscreen = false;
+        video.windowMode = WindowMode::Resizable;
     }
     video.framerate = 0; // Special value for HW vsync
     video.vbo = true;
@@ -224,6 +226,8 @@ void Settings::Load()
         video.fullscreenSize.width = iniVideo->getIntValue("fullscreen_width");
         video.fullscreenSize.height = iniVideo->getIntValue("fullscreen_height");
         video.fullscreen = iniVideo->getBoolValue("fullscreen");
+        const auto resizable = iniVideo->getValue("resizable_window", true);
+        video.windowMode = (resizable ? WindowMode::Resizable : WindowMode::NonResizable);
         video.framerate = iniVideo->getValue("framerate", 0);
         video.vbo = iniVideo->getBoolValue("vbo");
         video.shared_textures = iniVideo->getBoolValue("shared_textures");
@@ -402,6 +406,7 @@ void Settings::Save()
     iniVideo->setValue("windowed_width", video.windowedSize.width);
     iniVideo->setValue("windowed_height", video.windowedSize.height);
     iniVideo->setValue("fullscreen", video.fullscreen);
+    iniVideo->setValue("resizable_window", video.windowMode == WindowMode::Resizable);
     iniVideo->setValue("framerate", video.framerate);
     iniVideo->setValue("vbo", video.vbo);
     iniVideo->setValue("shared_textures", video.shared_textures);
diff --git a/libs/s25main/Settings.h b/libs/s25main/Settings.h
index a435a3242..01267b87d 100644
--- a/libs/s25main/Settings.h
+++ b/libs/s25main/Settings.h
@@ -5,6 +5,7 @@
 #pragma once
 
 #include "DrawPoint.h"
+#include "driver/VideoInterface.h"
 #include "driver/VideoMode.h"
 #include "s25util/ProxySettings.h"
 #include "s25util/Singleton.h"
@@ -61,6 +62,7 @@ class Settings : public Singleton<Settings, SingletonPolicies::WithLongevity>
         VideoMode fullscreenSize, windowedSize;
         signed short framerate; // <0 for unlimited, 0 for HW Vsync
         bool fullscreen;
+        WindowMode windowMode;
         bool vbo;
         bool shared_textures;
     } video;
diff --git a/libs/s25main/WindowManager.cpp b/libs/s25main/WindowManager.cpp
index e92a582f7..74ca28c00 100644
--- a/libs/s25main/WindowManager.cpp
+++ b/libs/s25main/WindowManager.cpp
@@ -602,7 +602,7 @@ void WindowManager::Msg_KeyDown(const KeyEvent& ke)
         // Switch Fullscreen/Windowed
         const auto newScreenSize =
           !SETTINGS.video.fullscreen ? SETTINGS.video.fullscreenSize : SETTINGS.video.windowedSize; //-V807
-        VIDEODRIVER.ResizeScreen(newScreenSize, !SETTINGS.video.fullscreen);
+        VIDEODRIVER.ResizeScreen(newScreenSize, SETTINGS.video.windowMode, !SETTINGS.video.fullscreen);
         SETTINGS.video.fullscreen = VIDEODRIVER.IsFullscreen();
     } else if(ke.kt == KeyType::Print)
         TakeScreenshot();
diff --git a/libs/s25main/desktops/dskBenchmark.cpp b/libs/s25main/desktops/dskBenchmark.cpp
index a65982f72..e5a3ea62f 100644
--- a/libs/s25main/desktops/dskBenchmark.cpp
+++ b/libs/s25main/desktops/dskBenchmark.cpp
@@ -131,7 +131,7 @@ void dskBenchmark::Msg_PaintAfter()
 void dskBenchmark::SetActive(bool activate)
 {
     if(!IsActive() && activate)
-        VIDEODRIVER.ResizeScreen(VideoMode(1600, 900), false);
+        VIDEODRIVER.ResizeScreen(VideoMode(1600, 900), WindowMode::Resizable, false);
     dskMenuBase::SetActive(activate);
 }
 
diff --git a/libs/s25main/desktops/dskOptions.cpp b/libs/s25main/desktops/dskOptions.cpp
index 633c691ea..3a78e6433 100644
--- a/libs/s25main/desktops/dskOptions.cpp
+++ b/libs/s25main/desktops/dskOptions.cpp
@@ -575,7 +575,7 @@ void dskOptions::Msg_ButtonClick(const unsigned ctrl_id)
             {
                 const auto screenSize =
                   SETTINGS.video.fullscreen ? SETTINGS.video.fullscreenSize : SETTINGS.video.windowedSize;
-                if(!VIDEODRIVER.ResizeScreen(screenSize, SETTINGS.video.fullscreen))
+                if(!VIDEODRIVER.ResizeScreen(screenSize, SETTINGS.video.windowMode, SETTINGS.video.fullscreen))
                 {
                     WINDOWMANAGER.Show(std::make_unique<iwMsgbox>(
                       _("Sorry!"), _("You need to restart your game to change the screen resolution!"), this,
diff --git a/libs/s25main/drivers/VideoDriverWrapper.cpp b/libs/s25main/drivers/VideoDriverWrapper.cpp
index c58a0534c..ba7678877 100644
--- a/libs/s25main/drivers/VideoDriverWrapper.cpp
+++ b/libs/s25main/drivers/VideoDriverWrapper.cpp
@@ -92,7 +92,7 @@ void VideoDriverWrapper::UnloadDriver()
  *
  *  @return Bei Erfolg @p true ansonsten @p false
  */
-bool VideoDriverWrapper::CreateScreen(const VideoMode size, const bool fullscreen)
+bool VideoDriverWrapper::CreateScreen(const VideoMode size, const WindowMode windowMode, const bool fullscreen)
 {
     if(!videodriver)
     {
@@ -100,7 +100,7 @@ bool VideoDriverWrapper::CreateScreen(const VideoMode size, const bool fullscree
         return false;
     }
 
-    if(!videodriver->CreateScreen(rttr::version::GetTitle(), size, fullscreen))
+    if(!videodriver->CreateScreen(rttr::version::GetTitle(), size, windowMode, fullscreen))
     {
         s25util::fatal_error("Could not create window!");
         return false;
@@ -134,7 +134,7 @@ bool VideoDriverWrapper::CreateScreen(const VideoMode size, const bool fullscree
  *
  *  @return Bei Erfolg @p true ansonsten @p false
  */
-bool VideoDriverWrapper::ResizeScreen(const VideoMode size, const bool fullscreen)
+bool VideoDriverWrapper::ResizeScreen(const VideoMode size, const WindowMode windowMode, const bool fullscreen)
 {
     if(!videodriver)
     {
@@ -142,7 +142,7 @@ bool VideoDriverWrapper::ResizeScreen(const VideoMode size, const bool fullscree
         return false;
     }
 
-    const bool result = videodriver->ResizeScreen(size, fullscreen);
+    const bool result = videodriver->ResizeScreen(size, windowMode, fullscreen);
 #ifdef _WIN32
     if(!videodriver->IsFullscreen())
     {
@@ -487,3 +487,8 @@ bool VideoDriverWrapper::IsFullscreen() const
 {
     return videodriver->IsFullscreen();
 }
+
+WindowMode VideoDriverWrapper::GetWindowMode() const
+{
+    return videodriver->GetWindowMode();
+}
diff --git a/libs/s25main/drivers/VideoDriverWrapper.h b/libs/s25main/drivers/VideoDriverWrapper.h
index 80b530145..e2d19c6c8 100644
--- a/libs/s25main/drivers/VideoDriverWrapper.h
+++ b/libs/s25main/drivers/VideoDriverWrapper.h
@@ -7,6 +7,7 @@
 #include "DriverWrapper.h"
 #include "Point.h"
 #include "driver/KeyEvent.h"
+#include "driver/VideoInterface.h"
 #include "driver/VideoMode.h"
 #include "s25util/Singleton.h"
 #include <memory>
@@ -35,9 +36,9 @@ class VideoDriverWrapper : public Singleton<VideoDriverWrapper, SingletonPolicie
     IVideoDriver* GetDriver() const { return videodriver.get(); }
 
     /// Erstellt das Fenster.
-    bool CreateScreen(VideoMode size, bool fullscreen);
+    bool CreateScreen(VideoMode size, WindowMode windowMode, bool fullscreen);
     /// Verändert Auflösung, Fenster/Fullscreen
-    bool ResizeScreen(VideoMode size, bool fullscreen);
+    bool ResizeScreen(VideoMode size, WindowMode windowMode, bool fullscreen);
     /// Viewport (neu) setzen
     void RenewViewport();
     /// zerstört das Fenster.
@@ -69,6 +70,7 @@ class VideoDriverWrapper : public Singleton<VideoDriverWrapper, SingletonPolicie
     /// Get the renderer size in pixels
     Extent GetRenderSize() const;
     bool IsFullscreen() const;
+    WindowMode GetWindowMode() const;
 
     bool IsLeftDown();
     bool IsRightDown();
diff --git a/libs/s25main/ingameWindows/iwSettings.cpp b/libs/s25main/ingameWindows/iwSettings.cpp
index edd878f70..8d39441a8 100644
--- a/libs/s25main/ingameWindows/iwSettings.cpp
+++ b/libs/s25main/ingameWindows/iwSettings.cpp
@@ -68,7 +68,7 @@ iwSettings::~iwSettings()
         {
             const auto screenSize =
               SETTINGS.video.fullscreen ? SETTINGS.video.fullscreenSize : SETTINGS.video.windowedSize;
-            if(!VIDEODRIVER.ResizeScreen(screenSize, SETTINGS.video.fullscreen))
+            if(!VIDEODRIVER.ResizeScreen(screenSize, SETTINGS.video.windowMode, SETTINGS.video.fullscreen))
             {
                 WINDOWMANAGER.Show(std::make_unique<iwMsgbox>(
                   _("Sorry!"), _("You need to restart your game to change the screen resolution!"), this,
diff --git a/tests/mockupDrivers/MockupVideoDriver.cpp b/tests/mockupDrivers/MockupVideoDriver.cpp
index 7b239109f..8bd56e133 100644
--- a/tests/mockupDrivers/MockupVideoDriver.cpp
+++ b/tests/mockupDrivers/MockupVideoDriver.cpp
@@ -29,16 +29,18 @@ bool MockupVideoDriver::Initialize()
     return true;
 }
 
-bool MockupVideoDriver::CreateScreen(const std::string&, const VideoMode& newSize, bool fullscreen)
+bool MockupVideoDriver::CreateScreen(const std::string&, const VideoMode& newSize, WindowMode windowMode,
+                                     bool fullscreen)
 {
-    ResizeScreen(newSize, fullscreen);
+    ResizeScreen(newSize, windowMode, fullscreen);
     return true;
 }
 
-bool MockupVideoDriver::ResizeScreen(const VideoMode& newSize, bool fullscreen)
+bool MockupVideoDriver::ResizeScreen(const VideoMode& newSize, WindowMode windowMode, bool fullscreen)
 {
     SetNewSize(newSize, Extent(newSize.width, newSize.height));
     isFullscreen_ = fullscreen;
+    windowMode_ = windowMode;
     return true;
 }
 
diff --git a/tests/mockupDrivers/MockupVideoDriver.h b/tests/mockupDrivers/MockupVideoDriver.h
index 2f24ccaf4..6cce2fd1e 100644
--- a/tests/mockupDrivers/MockupVideoDriver.h
+++ b/tests/mockupDrivers/MockupVideoDriver.h
@@ -13,8 +13,9 @@ class MockupVideoDriver : public VideoDriver
     ~MockupVideoDriver() override;
     const char* GetName() const override;
     bool Initialize() override;
-    bool CreateScreen(const std::string& title, const VideoMode& newSize, bool fullscreen) override;
-    bool ResizeScreen(const VideoMode& newSize, bool fullscreen) override;
+    bool CreateScreen(const std::string& title, const VideoMode& newSize, WindowMode windowMode,
+                      bool fullscreen) override;
+    bool ResizeScreen(const VideoMode& newSize, WindowMode windowMode, bool fullscreen) override;
     void DestroyScreen() override {}
     bool SwapBuffers() override { return true; }
     bool MessageLoop() override;