diff --git a/bittorrent-protocol/bittorrent-protocol-tests.ts b/bittorrent-protocol/bittorrent-protocol-tests.ts
index 227e4c3606..f5f6b4649f 100644
--- a/bittorrent-protocol/bittorrent-protocol-tests.ts
+++ b/bittorrent-protocol/bittorrent-protocol-tests.ts
@@ -3,7 +3,7 @@ import * as net from 'net';
 
 class TestExtension implements Protocol.Extension {
     constructor(protected wire: Protocol.Wire) { }
-    name: 'extname';
+    name = 'extname';
 }
 
 net.createServer(socket => {