diff --git a/test/core/fixtures/transformation/es6.constants/loop/options.json b/test/core/fixtures/transformation/es6.constants/loop/options.json
index 81e76d393f..ae231ea746 100644
--- a/test/core/fixtures/transformation/es6.constants/loop/options.json
+++ b/test/core/fixtures/transformation/es6.constants/loop/options.json
@@ -1,3 +1,3 @@
 {
-  "throws": "Duplicate declaration \"i\""
+  "throws": "\"i\" is read-only"
 }