diff --git a/include/osgProducer/KeyboardMouseCallback b/include/osgProducer/KeyboardMouseCallback
index 66ee95191..24ffa96d6 100644
--- a/include/osgProducer/KeyboardMouseCallback
+++ b/include/osgProducer/KeyboardMouseCallback
@@ -44,7 +44,7 @@ class OSGPRODUCER_EXPORT KeyboardMouseCallback : public Producer::KeyboardMouseC
         virtual void passiveMouseMotion( float mx, float my);
 
         virtual void buttonPress( float mx, float my, unsigned int mbutton );
-	virtual void doubleButtonPress( float mx, float mx, unsigned int mbutton);
+	virtual void doubleButtonPress( float mx, float my, unsigned int mbutton);
         virtual void buttonRelease( float mx, float my, unsigned int mbutton );
 
         virtual void keyPress( Producer::KeyCharacter key );