diff --git a/tiddlywiki5/styles.css b/tiddlywiki5/styles.css
index 15ddb692e..b29868498 100644
--- a/tiddlywiki5/styles.css
+++ b/tiddlywiki5/styles.css
@@ -72,7 +72,7 @@ a {
     text-decoration: none;
 }
 
-a.linkExternal::before {
+a.tw-tiddlylink-external::before {
     content: "\27a0\00a0";
 }