diff --git a/Extension/swgchooks.cpp b/Extension/swgchooks.cpp
index b156d13..e82396e 100644
--- a/Extension/swgchooks.cpp
+++ b/Extension/swgchooks.cpp
@@ -25,6 +25,10 @@ enum
 	eHooked
 };
 
+#ifdef WIN32_LEAN_AND_MEAN
+#undef SendMessage
+#endif
+
 SH_DECL_HOOK3(ISteamGameCoordinator, SendMessage, SH_NOATTRIB, 0, EGCResults, uint32, const void *, uint32);
 SH_DECL_HOOK1(ISteamGameCoordinator, IsMessageAvailable, SH_NOATTRIB, 0, bool, uint32 *);
 SH_DECL_HOOK4(ISteamGameCoordinator, RetrieveMessage, SH_NOATTRIB, 0, EGCResults, uint32 *, void *, uint32, uint32 *);