diff --git a/mediaqueries-5/Overview.bs b/mediaqueries-5/Overview.bs
index 94fd1be4074..b4c5bb05814 100644
--- a/mediaqueries-5/Overview.bs
+++ b/mediaqueries-5/Overview.bs
@@ -2715,7 +2715,7 @@ The {{CSSCustomMediaRule}} interface represents a ''@custom-media'' rule.
 <pre class="idl" export>
 typedef (MediaList or boolean) CustomMediaQuery;
 
-[Exposed=Window, RuntimeEnabled=CSSCustomMedia]
+[Exposed=Window]
 interface CSSCustomMediaRule : CSSRule {
     readonly attribute CSSOMString name;
     readonly attribute CustomMediaQuery query;