diff --git a/view/src/nsViewManager.cpp b/view/src/nsViewManager.cpp
index 2e63ebdfb17..3be0e091c8a 100644
--- a/view/src/nsViewManager.cpp
+++ b/view/src/nsViewManager.cpp
@@ -853,6 +853,8 @@ void nsViewManager :: AddRectToDirtyRegion(nsRect &aRect)
 
     if (NS_OK != rv)
       return;
+    else
+      mDirtyRegion->Init();
   }
 
   nsRect  trect = aRect;