diff --git a/packages/server/src/api.js b/packages/server/src/api.js
index 30b44f77..87d81dfd 100755
--- a/packages/server/src/api.js
+++ b/packages/server/src/api.js
@@ -1,4 +1,5 @@
 import path from "path"
+import fs from "fs"
 import { Server } from "linebridge/dist/server"
 
 import express from "express"