diff --git a/content/events/src/nsEventStateManager.cpp b/content/events/src/nsEventStateManager.cpp
index 118ed0c20c2..e9fef826b24 100644
--- a/content/events/src/nsEventStateManager.cpp
+++ b/content/events/src/nsEventStateManager.cpp
@@ -4225,6 +4225,10 @@ nsEventStateManager::ContentRemoved(nsIContent* aContent)
     mDragOverContent = nsnull;
   }
 
+  if (aContent == mLastMouseOverElement) {
+    mLastMouseOverElement = nsnull;
+  }
+
   return NS_OK;
 }