diff --git a/Extension/swgchooks.cpp b/Extension/swgchooks.cpp
index e82396e..b156d13 100644
--- a/Extension/swgchooks.cpp
+++ b/Extension/swgchooks.cpp
@@ -25,10 +25,6 @@ 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 *);
diff --git a/Extension/swgchooks.h b/Extension/swgchooks.h
index 53071ab..3ffc3be 100644
--- a/Extension/swgchooks.h
+++ b/Extension/swgchooks.h
@@ -23,6 +23,10 @@
 #include "smsdk_ext.h"
 #include "sourcehook.h"
 
+#ifdef _WIN32
+#undef SendMessage
+#endif
+
 class SteamWorksGCHooks
 {
 	public: