diff --git a/reactos/w32api/include/winbase.h b/reactos/w32api/include/winbase.h
index 53e3ce8a5fa..672f75a5bee 100644
--- a/reactos/w32api/include/winbase.h
+++ b/reactos/w32api/include/winbase.h
@@ -520,6 +520,11 @@ extern "C" {
 #define RESTART_NOTIFY_SOLUTION 0x2
 #define RESTART_NOTIFY_FAULT 0x4
 #endif
+#if (_WIN32_WINNT >= 0x0500)
+#define GET_MODULE_HANDLE_EX_FLAG_PIN 0x1
+#define GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT 0x2
+#define GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS 0x4
+#endif
 
 #ifndef RC_INVOKED
 #ifndef _FILETIME_