diff --git a/toolkit/content/contentAreaUtils.js b/toolkit/content/contentAreaUtils.js
index 9ac3264983a0..aedb91a1bbe4 100644
--- a/toolkit/content/contentAreaUtils.js
+++ b/toolkit/content/contentAreaUtils.js
@@ -649,7 +649,7 @@ function getPostData()
 {
   try {
     var sessionHistory = getWebNavigation().sessionHistory;
-    entry = sessionHistory.getEntryAtIndex(sessionHistory.index, false);
+    var entry = sessionHistory.getEntryAtIndex(sessionHistory.index, false);
     entry = entry.QueryInterface(Components.interfaces.nsISHEntry);
     return entry.postData;
   }