diff --git a/packages/base/src/features/OpenUI5Support.js b/packages/base/src/features/OpenUI5Support.js
index 31c51e494668..808b8c0c21d7 100644
--- a/packages/base/src/features/OpenUI5Support.js
+++ b/packages/base/src/features/OpenUI5Support.js
@@ -75,7 +75,7 @@ const cssVariablesLoaded = () => {
 		return;
 	}
 
-	return !!link.href.match(/\/css-variables\.css/);
+	return !!link.href.match(/\/css(-|_)variables\.css/);
 };
 
 const OpenUI5Support = {