diff --git a/src/msw/mediactrl.cpp b/src/msw/mediactrl.cpp
index 35f41e241c..ce385a136c 100644
--- a/src/msw/mediactrl.cpp
+++ b/src/msw/mediactrl.cpp
@@ -831,8 +831,6 @@ public:
 //---------------------------------------------------------------------------
 //  QT Compilation Guard
 //---------------------------------------------------------------------------
-#undef wxUSE_QUICKTIME
-#define wxUSE_QUICKTIME 1
 #if wxUSE_QUICKTIME
 
 //---------------------------------------------------------------------------