diff --git a/src/core/mixer.cpp b/src/core/mixer.cpp
index eb1c13ca5..65ef1ba0b 100644
--- a/src/core/mixer.cpp
+++ b/src/core/mixer.cpp
@@ -100,8 +100,6 @@ static void * aligned_malloc( int _bytes )
 }
 
 
-#undef QT_VERSION
-#define QT_VERSION 0x040300
 
 class mixerWorkerThread : public QThread
 {