diff --git a/lib/pubsub/index.js b/lib/pubsub/index.js
index 672f2d1e7c8..3a4c745f1fb 100644
--- a/lib/pubsub/index.js
+++ b/lib/pubsub/index.js
@@ -21,6 +21,7 @@
 'use strict';
 
 var arrify = require('arrify');
+var extend = require('extend');
 var is = require('is');
 var nodeutil = require('util');
 
@@ -380,7 +381,8 @@ PubSub.prototype.getTopics = function(query, callback) {
  * @param {module:pubsub/topic|string} - topic - The Topic to create a
  *     subscription to.
  * @param {string} subName - The name of the subscription.
- * @param {object=} options - Configuration object.
+ * @param {object=} options - See a
+ *     [Subscription resource](https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions)
  * @param {number} options.ackDeadlineSeconds - The maximum time after receiving
  *     a message that you must ack a message before it is redelivered.
  * @param {boolean} options.autoAck - Automatically acknowledge the message once
@@ -441,19 +443,17 @@ PubSub.prototype.subscribe = function(topic, subName, options, callback) {
     options = {};
   }
 
-  options = options || {};
-
   if (is.string(topic)) {
     topic = this.topic(topic);
   }
 
-  var body = {
+  var body = extend(true, {}, options, {
     topic: topic.name
-  };
+  });
 
-  if (options.ackDeadlineSeconds) {
-    body.ackDeadlineSeconds = options.ackDeadlineSeconds;
-  }
+  delete body.autoAck;
+  delete body.interval;
+  delete body.reuseExisting;
 
   this.request({
     method: 'PUT',
diff --git a/test/pubsub/index.js b/test/pubsub/index.js
index bd9bde925a8..2960a30b769 100644
--- a/test/pubsub/index.js
+++ b/test/pubsub/index.js
@@ -489,14 +489,37 @@ describe('PubSub', function() {
     });
 
     it('should pass options to the api request', function(done) {
-      var opts = { ackDeadlineSeconds: 90 };
+      var options = {
+        autoAck: true,
+        interval: 3,
+        reuseExisting: false,
+        ackDeadlineSeconds: 90,
+        pushConfig: {
+          pushEndpoint: 'https://domain/push'
+        }
+      };
+
+      var expectedBody = extend({}, options, {
+        topic: TOPIC_NAME
+      });
+
+      delete expectedBody.autoAck;
+      delete expectedBody.interval;
+      delete expectedBody.reuseExisting;
+
+      pubsub.topic = function() {
+        return {
+          name: TOPIC_NAME
+        };
+      };
 
       pubsub.request = function(reqOpts) {
-        assert.strictEqual(reqOpts.json.ackDeadlineSeconds, 90);
+        assert.notStrictEqual(reqOpts.json, options);
+        assert.deepEqual(reqOpts.json, expectedBody);
         done();
       };
 
-      pubsub.subscribe(TOPIC_NAME, SUB_NAME, opts, assert.ifError);
+      pubsub.subscribe(TOPIC_NAME, SUB_NAME, options, assert.ifError);
     });
 
     describe('error', function() {