diff --git a/rest_framework/static/rest_framework/js/default.js b/rest_framework/static/rest_framework/js/default.js
index c8812132c..22e5efde5 100644
--- a/rest_framework/static/rest_framework/js/default.js
+++ b/rest_framework/static/rest_framework/js/default.js
@@ -44,6 +44,10 @@ $('a[data-toggle="tab"]').click(function(){
 var selectedTab = null;
 var selectedTabName = getCookie('tabstyle');
 
+if (selectedTabName) {
+    selectedTabName = selectedTabName.replace(/[^a-z-]/g, '');
+}
+
 if (selectedTabName) {
     selectedTab = $('.form-switcher a[name=' + selectedTabName + ']');
 }