diff --git a/reactos/lib/3rdparty/mingw/crtexe.c b/reactos/lib/3rdparty/mingw/crtexe.c
index 71c934e8ad1..ce76fc19321 100644
--- a/reactos/lib/3rdparty/mingw/crtexe.c
+++ b/reactos/lib/3rdparty/mingw/crtexe.c
@@ -20,6 +20,7 @@
 #include <tchar.h>
 #include <sect_attribs.h>
 #include <locale.h>
+#include <intrin.h>
 
 #ifndef __winitenv
 extern wchar_t *** __MINGW_IMP_SYMBOL(__winitenv);
@@ -51,7 +52,11 @@ extern int * __MINGW_IMP_SYMBOL(_commode);
 #define _commode (* __MINGW_IMP_SYMBOL(_commode))
 extern int _dowildcard;
 
+#if defined(__GNUC__)
 int _MINGW_INSTALL_DEBUG_MATHERR __attribute__((weak)) = 0;
+#else
+int _MINGW_INSTALL_DEBUG_MATHERR = 0;
+#endif
 extern int __defaultmatherr;
 extern _CRTIMP void __cdecl _initterm(_PVFV *, _PVFV *);