diff --git a/include/wx/msw/missing.h b/include/wx/msw/missing.h
index e7522ee753..e60b865ab9 100644
--- a/include/wx/msw/missing.h
+++ b/include/wx/msw/missing.h
@@ -655,21 +655,6 @@ typedef struct
 
 #ifndef MUI_LANGUAGE_NAME
 #define MUI_LANGUAGE_NAME 0x8
-#endif
-
-//We need to check if we are using MinGW or mingw-w64 as their
-//definitions are different
-
-#ifdef __MINGW32__
-#include <_mingw.h>
-#endif
-
-#ifdef __MINGW32_TOOLCHAIN__
-typedef enum CommandStateChangeConstants {
-    CSC_UPDATECOMMANDS = (int) 0xFFFFFFFF,
-    CSC_NAVIGATEFORWARD = 0x1,
-    CSC_NAVIGATEBACK = 0x2
-} CommandStateChangeConstants;
 #endif
 
  /*