diff --git a/types/koa-bodyparser/index.d.ts b/types/koa-bodyparser/index.d.ts
index deb1eb04e9..9687f15ff9 100644
--- a/types/koa-bodyparser/index.d.ts
+++ b/types/koa-bodyparser/index.d.ts
@@ -1,6 +1,8 @@
-// Type definitions for koa-bodyparser 5.0
+// Type definitions for koa-bodyparser 4.2
 // Project: https://github.com/koajs/bodyparser
-// Definitions by: Jerry Chin <https://github.com/hellopao>, Anup Kishore <https://github.com/anup-2s>
+// Definitions by: Jerry Chin <https://github.com/hellopao>
+//                 Anup Kishore <https://github.com/anup-2s>
+//                 Hiroshi Ioka <https://github.com/hirochachacha>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -18,8 +20,8 @@ import * as Koa from "koa";
 
 declare module "koa" {
     interface Request {
-        body: {} | null | undefined;
-        rawBody: {} | null | undefined;
+        body: any;
+        rawBody: string;
     }
 }
 
diff --git a/types/koa-bodyparser/koa-bodyparser-tests.ts b/types/koa-bodyparser/koa-bodyparser-tests.ts
index e38eb112dd..6b14693914 100644
--- a/types/koa-bodyparser/koa-bodyparser-tests.ts
+++ b/types/koa-bodyparser/koa-bodyparser-tests.ts
@@ -7,6 +7,7 @@ app.use(bodyParser({ strict: false }));
 
 app.use((ctx) => {
     console.log(ctx.request.body);
+    console.log(ctx.request.body.ok);
     console.log(ctx.request.rawBody);
 });