diff --git a/lib/ace/lib/app_config.js b/lib/ace/lib/app_config.js
index 84b9e70c..bc5518d7 100644
--- a/lib/ace/lib/app_config.js
+++ b/lib/ace/lib/app_config.js
@@ -141,11 +141,11 @@ var AppConfig = function() {
                 opts[name].value = value;
         }
     };
-
+    
     this.setDefaultValues = function(path, optionHash) {
         Object.keys(optionHash).forEach(function(key) {
             this.setDefaultValue(path, key, optionHash[key]);
-        });
+        }, this);
     };
     
     this.warn = warn;