diff --git a/src/cocoa/dc.mm b/src/cocoa/dc.mm
index 7ef93f80ee..b74aa7bbf7 100644
--- a/src/cocoa/dc.mm
+++ b/src/cocoa/dc.mm
@@ -194,6 +194,7 @@ void wxDC::CocoaUnapplyTransformations()
     invertTransform = [m_cocoaWxToBoundsTransform copy];
     [invertTransform invert];
     [invertTransform concat];
+    [invertTransform release];
 }
 
 bool wxDC::CocoaGetBounds(void *rectData)