diff --git a/kfet/static/kfet/js/history.js b/kfet/static/kfet/js/history.js
index 291cc675..c1610421 100644
--- a/kfet/static/kfet/js/history.js
+++ b/kfet/static/kfet/js/history.js
@@ -21,7 +21,7 @@ class KHistory {
     }
 
     constructor(options) {
-        var all_options = $.extend({}, this.constructor.default_options, options);
+        var all_options = $.extend(true, {}, this.constructor.default_options, options);
         this.api_options = all_options.api_options;
 
         this._$container = $('#history');