diff --git a/build/cmake/CMakeModules/AddExtraCompilationFlags.cmake b/build/cmake/CMakeModules/AddExtraCompilationFlags.cmake
index 2d59fabb..e480c7ea 100644
--- a/build/cmake/CMakeModules/AddExtraCompilationFlags.cmake
+++ b/build/cmake/CMakeModules/AddExtraCompilationFlags.cmake
@@ -132,10 +132,8 @@ MACRO(ADD_EXTRA_COMPILATION_FLAGS)
         endif (ACTIVATE_WARNING_CAST_ALIGN)
 
         if (ACTIVATE_WARNING_STRICT_PROTOTYPES)
-            list(APPEND CMAKE_CXX_FLAGS ${WARNING_STRICT_PROTOTYPES})
             list(APPEND CMAKE_C_FLAGS ${WARNING_STRICT_PROTOTYPES})
         else ()
-            string(REPLACE ${WARNING_STRICT_PROTOTYPES} "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
             string(REPLACE ${WARNING_STRICT_PROTOTYPES} "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
         endif (ACTIVATE_WARNING_STRICT_PROTOTYPES)