diff --git a/src/js/3p-filters.js b/src/js/3p-filters.js
index 62d9dadee..276706e05 100644
--- a/src/js/3p-filters.js
+++ b/src/js/3p-filters.js
@@ -424,6 +424,8 @@ var buttonUpdateHandler = function() {
 var buttonPurgeAllHandler = function() {
     uDom('#buttonPurgeAll').removeClass('enabled');
 
+    renderBusyOverlay(true);
+
     var onCompleted = function() {
         cacheWasPurged = true;
         renderFilterLists();