diff --git a/themes/tiddlywiki/snowwhite/base.tid b/themes/tiddlywiki/snowwhite/base.tid
index 6df97cac1..56b688b64 100644
--- a/themes/tiddlywiki/snowwhite/base.tid
+++ b/themes/tiddlywiki/snowwhite/base.tid
@@ -143,6 +143,12 @@ a.tw-tiddlylink-missing {
 	font-style: italic;
 }
 
+a.tw-tiddlylink-external:before {
+	display: inline-block;
+	content: "\29C9";
+	padding-right: 0.2em;
+}
+
 /*
 ** Drag and drop styles
 */