diff --git a/src/doctor.ts b/src/doctor.ts
index ca1f81afa5b0d28f768cd73acca3c6e7aff6fa11..7c3d6bb14270f818c4ae548638a41f16e21f7233 100644
--- a/src/doctor.ts
+++ b/src/doctor.ts
@@ -6,7 +6,10 @@
  * https://github.com/zixia/wechaty
  *
  */
-import { createServer, Socket } from 'net'
+import {
+  createServer,
+  Socket,
+}                   from 'net'
 
 import {
   log,