diff --git a/src/@types/koa-json-body.d.ts b/src/@types/koa-json-body.d.ts
new file mode 100644
index 0000000000..5aa8179c5b
--- /dev/null
+++ b/src/@types/koa-json-body.d.ts
@@ -0,0 +1,15 @@
+declare module 'koa-json-body' {
+	import { Middleware } from 'koa';
+
+	interface IKoaJsonBodyOptions {
+		strict: boolean;
+		limit: string;
+		fallback: boolean;
+	}
+
+	function koaJsonBody(opt?: IKoaJsonBodyOptions): Middleware;
+
+	namespace koaJsonBody {} // Hack
+
+	export = koaJsonBody;
+}
diff --git a/src/server/activitypub.ts b/src/server/activitypub.ts
index 20a8ee9794..0c0ae6c529 100644
--- a/src/server/activitypub.ts
+++ b/src/server/activitypub.ts
@@ -1,6 +1,6 @@
 import { ObjectID } from 'mongodb';
 import * as Router from 'koa-router';
-const json = require('koa-json-body');
+import * as json from 'koa-json-body';
 import * as httpSignature from 'http-signature';
 
 import { createHttpJob } from '../queue';