diff --git a/src/js/select2/defaults.js b/src/js/select2/defaults.js
index ad4d224f84..836a3818e4 100644
--- a/src/js/select2/defaults.js
+++ b/src/js/select2/defaults.js
@@ -387,7 +387,7 @@ define([
 
     var convertedData = Utils._convertData(data);
 
-    $.extend(this.defaults, convertedData);
+    $.extend(true, this.defaults, convertedData);
   };
 
   var defaults = new Defaults();