diff --git a/css-highlight-api-1/Overview.bs b/css-highlight-api-1/Overview.bs
index aa09f5f5c53..0dbaa65d69d 100644
--- a/css-highlight-api-1/Overview.bs
+++ b/css-highlight-api-1/Overview.bs
@@ -236,7 +236,7 @@ Registering Custom Highlights</h3>
 	};
 
 	[Exposed=Window]
-	partial interface HighlightRegistry {
+	interface HighlightRegistry {
 		maplike<DOMString, Highlight>;
 	};
 	</xmp>