diff --git a/MouseTypes.h b/MouseTypes.h
index ac908486..3dea13d9 100644
--- a/MouseTypes.h
+++ b/MouseTypes.h
@@ -7,7 +7,7 @@ typedef UInt8			ButtonID;
 // mouse button identifiers
 static const ButtonID	kButtonNone   = 0;
 static const ButtonID	kButtonLeft   = 1;
-static const ButtonID	kButtonRight  = 2;
-static const ButtonID	kButtonMiddle = 3;
+static const ButtonID	kButtonMiddle = 2;
+static const ButtonID	kButtonRight  = 3;
 
 #endif