1 files changed, 2 insertions, 2 deletions
diff --git a/js/performance_test.ts b/js/performance_test.ts
index 8f9dbc990..1238a3836 100644
--- a/js/performance_test.ts
+++ b/js/performance_test.ts
@@ -1,9 +1,9 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { testPerm, assert } from "./test_util.ts";
 
-testPerm({ highPrecision: false }, function now() {
+testPerm({ highPrecision: false }, function now(): void {
   const start = performance.now();
-  setTimeout(() => {
+  setTimeout((): void => {
     const end = performance.now();
     assert(end - start >= 10);
   }, 10);