diff --git a/tests/src/rules/no-duplicates.js b/tests/src/rules/no-duplicates.js
index 7e4bacdc99..1530f9da3d 100644
--- a/tests/src/rules/no-duplicates.js
+++ b/tests/src/rules/no-duplicates.js
@@ -486,6 +486,7 @@ context('TypeScript', function () {
       const invalid = [
         test({
           code: "import type x from './foo'; import type y from './foo'",
+          output: "import type x from './foo'; import type y from './foo'",
           ...parserConfig,
           errors: [
             {