diff --git a/ts/editor/codeMirror.ts b/ts/editor/codeMirror.ts
index a0d04812e..dc7403415 100644
--- a/ts/editor/codeMirror.ts
+++ b/ts/editor/codeMirror.ts
@@ -24,7 +24,7 @@ export const htmlanki = {
     },
 };
 
-const noop = () => {
+const noop = (): void => {
     /* noop */
 };