diff --git a/toolkit/components/places/nsLivemarkService.js b/toolkit/components/places/nsLivemarkService.js
index 58ed8d59431a..945012f28b24 100644
--- a/toolkit/components/places/nsLivemarkService.js
+++ b/toolkit/components/places/nsLivemarkService.js
@@ -652,8 +652,8 @@ Livemark.prototype = {
         let nodes = this._nodes.get(container);
         for (let node of nodes) {
           // Workaround for bug 449811.
-          localObserver = observer;
-          localNode = node;
+          let localObserver = observer;
+          let localNode = node;
           if (!aURI || node.uri == aURI.spec) {
             Services.tm.mainThread.dispatch(() => {
               localObserver.nodeHistoryDetailsChanged(localNode, 0, aVisitedStatus);