diff --git a/toolkit/components/places/src/nsPlacesDBFlush.js b/toolkit/components/places/src/nsPlacesDBFlush.js
index f32e4131a80..ba08ee0f192 100644
--- a/toolkit/components/places/src/nsPlacesDBFlush.js
+++ b/toolkit/components/places/src/nsPlacesDBFlush.js
@@ -259,6 +259,7 @@ nsPlacesDBFlush.prototype = {
   //onEndUpdateBatch: function() { },
   onVisit: function(aURI, aVisitID, aTime, aSessionID, aReferringID, aTransitionType) { },
   onTitleChanged: function(aURI, aPageTitle) { },
+  onBeforeDeleteURI: function(aURI) { },
   onDeleteURI: function(aURI) { },
   onClearHistory: function() { },
   onPageChanged: function(aURI, aWhat, aValue) { },