--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -2450,17 +2450,16 @@ nsIFrame::BuildDisplayListForStackingCon
         dirtyRect = aBuilder->GetPreserves3DRects();
       }
 
       nsRect untransformedDirtyRect;
       if (nsDisplayTransform::UntransformRect(dirtyRect, overflow, this,
             &untransformedDirtyRect)) {
         dirtyRect = untransformedDirtyRect;
       } else {
-        NS_WARNING("Unable to untransform dirty rect!");
         // This should only happen if the transform is singular, in which case nothing is visible anyway
         dirtyRect.SetEmpty();
       }
     }
     inTransform = true;
   }
 
   bool usingFilter = StyleEffects()->HasFilters();