diff --git a/core/constants.js b/core/constants.js
index b1b26c9a..fe23f5f6 100644
--- a/core/constants.js
+++ b/core/constants.js
@@ -262,7 +262,7 @@ const Regex = {
     'FONT_AWESOME_WITH_CODE': /use\.fontawesome\.com\/[a-z0-9]{10}\.(js|css)/,
     'FONT_AWESOME_FONTS_ONLY': /\/font-?awesome\/(?:\d{1,2}\.){1,3}\d{1,2}\/fonts\//,
     'BOOTSTRAP_FONTS_ONLY': /\/bootstrap\/(?:\d{1,2}\.){1,3}\d{1,2}\/fonts\//,
-    'ROCKET_LOADER': /ajax\.cloudflare\.com\/cdn-cgi\/scripts\/[\d\w]{8}\/cloudflare-static\/rocket-loader\.min\.js/
+    'ROCKET_LOADER': /ajax\.cloudflare\.com\/cdn-cgi\/scripts\/[a-zA-Z0-9]{8}\/cloudflare-static\/rocket-loader\.min\.js/
 };
 
 const MaterialIcons = {