diff --git a/src/mac/carbon/window.cpp b/src/mac/carbon/window.cpp
index 1a23e54047..6d86234520 100644
--- a/src/mac/carbon/window.cpp
+++ b/src/mac/carbon/window.cpp
@@ -201,7 +201,6 @@ static pascal OSStatus wxMacWindowControlEventHandler( EventHandlerCallRef handl
                 RgnHandle updateRgn = NULL ;
                 RgnHandle allocatedRgn = NULL ;
                 wxRegion visRegion = thisWindow->MacGetVisibleRegion() ;
-                Rect controlBounds ;
 
                 if ( cEvent.GetParameter<RgnHandle>(kEventParamRgnHandle, &updateRgn) != noErr )
                 {
@@ -3436,4 +3435,4 @@ bool wxWindowMac::CanSetTransparent()
 wxByte wxWindowMac::GetTransparent() const 
 {
     return m_macAlpha ;
-}
\ No newline at end of file
+}