diff --git a/lib/agent.js b/lib/agent.js
index 16c9560a..ad540470 100644
--- a/lib/agent.js
+++ b/lib/agent.js
@@ -29,6 +29,7 @@ function TestAgent(app, options) {
     this._ca = options.ca;
     this._key = options.key;
     this._cert = options.cert;
+    this._prefix = options.prefix;
   }
   Agent.call(this);
   this.app = app;
@@ -49,7 +50,8 @@ TestAgent.prototype.host = function(host) {
 // override HTTP verb methods
 methods.forEach(function(method) {
   TestAgent.prototype[method] = function(url, fn) { // eslint-disable-line no-unused-vars
-    var req = new Test(this.app, method.toUpperCase(), url, this._host);
+    // TODO: support prefix on actual urls (with a domain or protocal)
+    var req = new Test(this.app, method.toUpperCase(), (this._prefix || '') + url, this._host);
     req.ca(this._ca);
     req.cert(this._cert);
     req.key(this._key);
diff --git a/test/supertest.js b/test/supertest.js
index dfa90a7c..e8b72b6c 100644
--- a/test/supertest.js
+++ b/test/supertest.js
@@ -891,6 +891,24 @@ describe('agent.host(host)', function () {
   });
 });
 
+describe('request.agent(app, {prefix})', function () {
+  it('should apply prefix', function(done) {
+    var app = express();
+    var agent = request.agent(app, { prefix: '/api' });
+    app.use('/api/something', function(err, res) {
+      res.send();
+    });
+
+    agent
+      .get('/dummy')
+      .expect(404, 'Cannot GET /api/dummy\n');
+
+    agent
+      .get('/something')
+      .expect(200, done);
+  });
+});
+
 describe('.<http verb> works as expected', function () {
   it('.delete should work', function (done) {
     const app = express();