diff --git a/www/common/common-interface.js b/www/common/common-interface.js
index 7cb257b87..2dd2a9e85 100644
--- a/www/common/common-interface.js
+++ b/www/common/common-interface.js
@@ -600,7 +600,7 @@ define([
     };
     UI.confirmButton = function (originalBtn, config, _cb) {
         config = config || {};
-        cb = Util.once(Util.mkAsync(_cb));
+        var cb = Util.once(Util.mkAsync(_cb));
 
         var classes = 'btn ' + (config.classes || 'btn-primary');