diff --git a/include/windef.h b/include/windef.h
index de226e0ed38..834ad3857aa 100644
--- a/include/windef.h
+++ b/include/windef.h
@@ -29,6 +29,12 @@
 #define WINVER 0x0500
 #endif
 
+#ifndef NO_STRICT
+# ifndef STRICT
+#  define STRICT
+# endif /* STRICT */
+#endif /* NO_STRICT */
+
 #include "winnt.h"