diff --git a/packages/ui-default/backendlib/markdown-it-xss.ts b/packages/ui-default/backendlib/markdown-it-xss.ts
index bcf8e1305..558d7fae1 100644
--- a/packages/ui-default/backendlib/markdown-it-xss.ts
+++ b/packages/ui-default/backendlib/markdown-it-xss.ts
@@ -49,7 +49,7 @@ const cssFilterOptions = {
   },
 };
 
-const CssFilter = new FilterXSS(cssFilterOptions);
+const CssFilter = new FilterCSS(cssFilterOptions);
 
 const commonRules = {
   whiteList: {