diff --git a/mozilla/xpcom/tests/utils/io.js b/mozilla/xpcom/tests/utils/io.js
index 8ec63a5fdb6..b1424e79838 100644
--- a/mozilla/xpcom/tests/utils/io.js
+++ b/mozilla/xpcom/tests/utils/io.js
@@ -578,7 +578,7 @@ leaf  : function (path) {
     return null;
   }
 
-  fileInst = new FilePath(path);
+  var fileInst = new FilePath(path);
 
   return fileInst.leafName;