1 files changed, 1 insertions, 1 deletions
diff --git a/flags/whitespace_test.ts b/flags/whitespace_test.ts
index f0f24703c..9e6ba7115 100755
--- a/flags/whitespace_test.ts
+++ b/flags/whitespace_test.ts
@@ -3,6 +3,6 @@ import { test } from "../testing/mod.ts";
 import { assertEquals } from "../testing/asserts.ts";
 import { parse } from "./mod.ts";
 
-test(function whitespaceShouldBeWhitespace() {
+test(function whitespaceShouldBeWhitespace(): void {
   assertEquals(parse(["-x", "\t"]).x, "\t");
 });