diff --git a/modoboa/static/js/history.js b/modoboa/static/js/history.js
index 562aa4605..72cd2c069 100644
--- a/modoboa/static/js/history.js
+++ b/modoboa/static/js/history.js
@@ -134,16 +134,12 @@ History.prototype = {
         }
         var elems = str.split('&');
         for (var i = 0; i < elems.length; i++) {
-            this.setparamfromstring(elems[i]);
+            var pdef = elems[i].split('=');
+            this.setparam(pdef[0], pdef[1]);
         }
         return this;
     },
 
-    setparamfromstring: function(str) {
-        var def = str.split('=');
-        this.params[def[0]] = def[1];
-    },
-
     setparam: function(name, value, encode) {
         if (encode == undefined || encode) {
             this.params[name] = encodeURIComponent(value);