diff --git a/src/js/3p-filters.js b/src/js/3p-filters.js
index 6249dad02..782c80085 100644
--- a/src/js/3p-filters.js
+++ b/src/js/3p-filters.js
@@ -37,8 +37,6 @@ var cacheWasPurged = false;
 var needUpdate = false;
 var hasCachedContent = false;
 
-var re3rdPartyExternalAsset = /^https?:\/\/[a-z0-9]+/;
-
 /******************************************************************************/
 
 var onMessage = function(msg) {