diff --git a/reactos/include/psdk/guiddef.h b/reactos/include/psdk/guiddef.h
index 5ca3566dfb4..e5e4094f03b 100644
--- a/reactos/include/psdk/guiddef.h
+++ b/reactos/include/psdk/guiddef.h
@@ -31,6 +31,10 @@ typedef struct _GUID
 } GUID;
 #endif
 
+#ifndef DECLSPEC_SELECTANY
+#define DECLSPEC_SELECTANY __declspec(selectany)
+#endif
+
 #undef DEFINE_GUID
 
 #ifdef INITGUID