diff --git a/src/SystemManager.hh b/src/SystemManager.hh
index a1813b1f148..006f22a8734 100644
--- a/src/SystemManager.hh
+++ b/src/SystemManager.hh
@@ -37,7 +37,7 @@ namespace ignition
     inline namespace IGNITION_GAZEBO_VERSION_NAMESPACE {
 
     /// \brief Used to load / unload sysetms as well as iterate over them.
-    class SystemManager
+    class IGNITION_GAZEBO_HIDDEN SystemManager
     {
       /// \brief Constructor
       /// \param[in] _systemLoader A pointer to a SystemLoader to load plugins