diff --git a/reactos/include/psdk/winnt.h b/reactos/include/psdk/winnt.h
index bfaab02e6ef..91f604d2dcb 100644
--- a/reactos/include/psdk/winnt.h
+++ b/reactos/include/psdk/winnt.h
@@ -1360,6 +1360,9 @@ typedef enum
 #define DLL_PROCESS_ATTACH	1
 #define DLL_THREAD_ATTACH	2
 #define DLL_THREAD_DETACH	3
+#ifdef __WINESRC__
+#define DLL_WINE_PREATTACH	8 /* Never called, but defined for compatibility with Wine source */
+#endif
 #define TAPE_ABSOLUTE_POSITION 0
 #define TAPE_LOGICAL_POSITION 1
 #define TAPE_PSEUDO_LOGICAL_POSITION 2