diff --git a/test/core/fixtures/transformation/es7.trailing-function-commas/arrow-function/expected.js b/test/core/fixtures/transformation/es7.trailing-function-commas/arrow-function/expected.js
index cf585a0a16..e3c54f65fb 100644
--- a/test/core/fixtures/transformation/es7.trailing-function-commas/arrow-function/expected.js
+++ b/test/core/fixtures/transformation/es7.trailing-function-commas/arrow-function/expected.js
@@ -1 +1,3 @@
+"use strict";
+
 (function (x, y) {});