diff --git a/test/compliance.spec.js b/test/compliance.spec.js
index 5e76a64..1339086 100644
--- a/test/compliance.spec.js
+++ b/test/compliance.spec.js
@@ -8,7 +8,7 @@ const TCP = require('../src')
 describe('interface-transport compliance', () => {
   tests({
     setup (cb) {
-      let tcp = new TCP()
+      const tcp = new TCP()
       const addrs = [
         multiaddr('/ip4/127.0.0.1/tcp/9091'),
         multiaddr('/ip4/127.0.0.1/tcp/9092'),