diff --git a/reactos/include/windows.h b/reactos/include/windows.h
index 6d107712b05..4fab00737fb 100644
--- a/reactos/include/windows.h
+++ b/reactos/include/windows.h
@@ -165,6 +165,10 @@
 #define DUMMYSTRUCTNAME3
 #endif
 
+#ifndef DECLARE_STDCALL_P
+#define DECLARE_STDCALL_P( type ) __stdcall type
+#endif
+
 #ifndef NO_STRICT
 #ifndef STRICT
 #define STRICT 1