diff --git a/kmix/mixertoolbox.cpp b/kmix/mixertoolbox.cpp
index cd17196c..66e0241c 100644
--- a/kmix/mixertoolbox.cpp
+++ b/kmix/mixertoolbox.cpp
@@ -32,6 +32,7 @@
 
 #include "mixertoolbox.h"
 
+#ifndef KMIX_PLATFORMS_CPP
 typedef Mixer_Backend *getMixerFunc( int device );
 typedef TQString getDriverNameFunc( );
 typedef DevIterator* getDevIteratorFunc( );
@@ -43,6 +44,7 @@ struct MixerFactory {
 };
 
 extern MixerFactory g_mixerFactories[];
+#endif
 
 /***********************************************************************************
  Attention: