diff --git a/dlls/msvcrt/cxx.h b/dlls/msvcrt/cxx.h
index 42717f9d702..f8fe239b8aa 100644
--- a/dlls/msvcrt/cxx.h
+++ b/dlls/msvcrt/cxx.h
@@ -240,7 +240,7 @@ typedef struct
 
 #endif
 
-#if defined(__i386__) && !defined(__MINGW32__)
+#ifdef __ASM_USE_THISCALL_WRAPPER
 
 #define CALL_VTBL_FUNC(this, off, ret, type, args) ((ret (WINAPI*)type)&vtbl_wrapper_##off)args