diff --git a/src/model_class_methods.js b/src/model_class_methods.js
index 77cb86c..95e2ca7 100644
--- a/src/model_class_methods.js
+++ b/src/model_class_methods.js
@@ -69,7 +69,7 @@ Model.ClassMethods = {
           self.add(models[i])
         }
 
-        if (callback) callback(models)
+        if (callback) callback.call(self, models)
       })
     }