diff --git a/packages/server/test/unit/socket_spec.js b/packages/server/test/unit/socket_spec.js
index db7020b0482c..8f21e65125fd 100644
--- a/packages/server/test/unit/socket_spec.js
+++ b/packages/server/test/unit/socket_spec.js
@@ -642,6 +642,11 @@ describe('lib/socket', () => {
       this.mockClient = sinon.stub({
         on () {},
         emit () {},
+        conn: {
+          transport: {
+            name: 'websocket',
+          },
+        },
       })
 
       this.io = {