diff --git a/src/browser/renderer/dom/StyleSheet.ts b/src/browser/renderer/dom/StyleSheet.ts
index a9d9d4b35f..c4cb7bd7e8 100644
--- a/src/browser/renderer/dom/StyleSheet.ts
+++ b/src/browser/renderer/dom/StyleSheet.ts
@@ -12,7 +12,7 @@ const createCssStyleSheet = (): IStyleSheet => {
       document.adoptedStyleSheets.splice(index, 1);
     },
     setCss(css) {
-      sheet.replace(css);
+      sheet.replaceSync(css);
     }
   };
 };