diff --git a/lib/dao.js b/lib/dao.js
index fc096aed..43916d05 100644
--- a/lib/dao.js
+++ b/lib/dao.js
@@ -2407,7 +2407,7 @@ DataAccessObject.prototype.updateAttributes = function updateAttributes(data, op
     if (strict && !allowExtendedOperators) {
       var props = Model.definition.properties;
       var keys = Object.keys(data);
-      var result = {};
+      var result = {}, key;
       for (var i = 0; i < keys.length; i++) {
         key = keys[i];
         if (props[key]) {