diff --git a/lib/index.js b/lib/index.js
index 6d018f0..8b0f8bc 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -35,10 +35,6 @@ function isObject(value) {
  * const Person = DeepModel.extend({...})
  */
 export default class DeepModel extends Backbone.Model {
-  static extend(...args) {
-    return Backbone.Model.extend(...args)
-  }
-
   /**
    * this module's version.
    */
@@ -156,3 +152,5 @@ export default class DeepModel extends Backbone.Model {
     return super.set(newAttrs, options)
   }
 }
+
+DeepModel.extend = Backbone.Model.extend