diff --git a/lib/agent.js b/lib/agent.js
index 5f16ae3d..d7bef5c5 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;
@@ -43,7 +44,8 @@ TestAgent.prototype.__proto__ = Agent.prototype;
 // 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);
+    // TODO: support prefix on actual urls
+    var req = new Test(this.app, method.toUpperCase(), (this._prefix || '') + url);
     req.ca(this._ca);
     req.cert(this._cert);
     req.key(this._key);
diff --git a/test/supertest.js b/test/supertest.js
index c9a4927b..03590e86 100644
--- a/test/supertest.js
+++ b/test/supertest.js
@@ -815,6 +815,17 @@ describe('request.agent(app)', function() {
   });
 });
 
+describe('request.agent(app, {prefix})', function() {
+  it('should apply prefix', function(done) {
+    var app = express();
+    var agent = request.agent(app, { prefix: '/api' });
+
+    agent
+      .get('/dummy')
+      .expect(404, 'Cannot GET /api/dummy\n', done);
+  });
+});
+
 describe('.<http verb> works as expected', function() {
   it('.delete should work', function (done) {
     var app = express();