diff --git a/src/web/helper/form.ts b/src/web/helper/form.ts
index 8ab502f..d126153 100644
--- a/src/web/helper/form.ts
+++ b/src/web/helper/form.ts
@@ -1,5 +1,5 @@
-import { Middleware } from "koa";
 import getTemplate from "./hb";
+import { Context } from "vm";
 
 interface IFormConfigField {
    type: "text" | "number" | "boolean" | "textarea";
@@ -9,7 +9,7 @@ interface IFormConfigField {
 
 type IFormConfig = { [name: string]: IFormConfigField }
 
-export default function getForm(url: string, title: string, fieldConfig: IFormConfig): Middleware {
+export default function getForm(url: string, title: string, fieldConfig: IFormConfig): (ctx: Context) => void {
    let fields = Object.keys(fieldConfig).map(name => ({ name, ...fieldConfig[name] }))
 
    return ctx => ctx.body = getTemplate("forms")({