diff --git a/types/chai-http/chai-http-tests.ts b/types/chai-http/chai-http-tests.ts
index 7c1c7a6b42..f4f65cae7b 100644
--- a/types/chai-http/chai-http-tests.ts
+++ b/types/chai-http/chai-http-tests.ts
@@ -41,6 +41,16 @@ chai.request(app)
 	.get('/search')
 	.query({ name: 'foo', limit: 10 });
 
+chai.request(app)
+	.get('/download')
+	.buffer()
+	.parse((res, cb) => {
+		let data = '';
+		res.setEncoding('binary');
+		res.on('data', (chunk: any) => { data += chunk; });
+		res.on('end', () => { cb(undefined, new Buffer(data, 'binary')); });
+	});
+
 chai.request(app)
 	.put('/user/me')
 	.send({ passsword: '123', confirmPassword: '123' })
diff --git a/types/chai-http/index.d.ts b/types/chai-http/index.d.ts
index f0957cc454..6a9404c9da 100644
--- a/types/chai-http/index.d.ts
+++ b/types/chai-http/index.d.ts
@@ -49,6 +49,8 @@ declare global {
 			type: string;
 			status: number;
 			text: string;
+			setEncoding(encoding: string): void;
+			on(event: string, fn: (...args: any[]) => void): void;
 		}
 
 		interface Request extends FinishedRequest {
@@ -59,6 +61,7 @@ declare global {
 			auth(user: string, name: string): Request;
 			field(name: string, val: string): Request;
 			buffer(): Request;
+			parse(fn: (res: Response, cb: (e?: Error, r?: any) => void) => void): Request;
 			end(callback?: (err: any, res: Response) => void): FinishedRequest;
 		}