1 files changed, 1 insertions, 1 deletions
diff --git a/tests/cat.ts b/tests/cat.ts
index deb2be2f3..756238be6 100644
--- a/tests/cat.ts
+++ b/tests/cat.ts
@@ -1,6 +1,6 @@
 const { stdout, open, copy, args } = Deno;
 
-async function main() {
+async function main(): Promise<void> {
   for (let i = 1; i < args.length; i++) {
     const filename = args[i];
     const file = await open(filename);