diff --git a/pkgs/development/compilers/llvm/15/clang/default.nix b/pkgs/development/compilers/llvm/15/clang/default.nix
index 6102947b1afd8..faf3452c6a4ed 100644
--- a/pkgs/development/compilers/llvm/15/clang/default.nix
+++ b/pkgs/development/compilers/llvm/15/clang/default.nix
@@ -28,7 +28,6 @@ let
 
     cmakeFlags = [
       "-DCLANG_INSTALL_PACKAGE_DIR=${placeholder "dev"}/lib/cmake/clang"
-      "-DCMAKE_CXX_FLAGS=-std=c++14"
       "-DCLANGD_BUILD_XPC=OFF"
       "-DLLVM_ENABLE_RTTI=ON"
     ] ++ lib.optionals enableManpages [