diff --git a/themes/tiddlywiki/vanilla/filter.tid b/themes/tiddlywiki/vanilla/filter.tid
index 17d194066..dc63b8cef 100644
--- a/themes/tiddlywiki/vanilla/filter.tid
+++ b/themes/tiddlywiki/vanilla/filter.tid
@@ -22,7 +22,7 @@ tags: $:/tags/Stylesheet
 
 			<$set name="CSSEscapedTitle" value={{{ [<filteredTiddler>escapecss[]] }}}>
 
-				[data-tiddler-title={{{ [<CSSEscapedTitle>] }}}].tc-tiddler-frame {
+				[data-tiddler-title="<<CSSEscapedTitle>>"].tc-tiddler-frame {
 					outline: 2px solid <<colour primary>>;
 				}