diff --git a/tests/utils.ts b/tests/utils.ts
index f6750e4..6992024 100644
--- a/tests/utils.ts
+++ b/tests/utils.ts
@@ -182,7 +182,7 @@ export async function sendWsMessage(
     socket.onopen = (_event): void => {
       socket.onmessage = (event): void => {
         socket.terminate();
-        return resolve(<Buffer>event.data);
+        return resolve(event.data as Buffer);
       };
 
       socket.send(message);