diff --git a/api.js b/api.js
index a96503b37..2b6c5f207 100644
--- a/api.js
+++ b/api.js
@@ -6,7 +6,6 @@ var fs = require('fs');
 var flatten = require('arr-flatten');
 var Promise = require('bluebird');
 var figures = require('figures');
-var objectAssign = require('object-assign');
 var globby = require('globby');
 var chalk = require('chalk');
 var fork = require('./lib/fork');
@@ -18,9 +17,7 @@ function Api(files, options) {
 
 	EventEmitter.call(this);
 
-	objectAssign(this, options);
-	this.options = options;
-
+	this.options = options || {};
 	this.rejectionCount = 0;
 	this.exceptionCount = 0;
 	this.passCount = 0;
diff --git a/test/api.js b/test/api.js
index 778706f5f..310997588 100644
--- a/test/api.js
+++ b/test/api.js
@@ -63,7 +63,7 @@ test('fail-fast mode', function (t) {
 
 	api.run()
 		.then(function () {
-			t.ok(api.failFast);
+			t.ok(api.options.failFast);
 			t.is(api.passCount, 1);
 			t.is(api.failCount, 1);
 			t.true(/false fail false/.test(api.errors[0].error.message));
@@ -79,7 +79,7 @@ test('serial execution mode', function (t) {
 
 	api.run()
 		.then(function () {
-			t.ok(api.serial);
+			t.ok(api.options.serial);
 			t.is(api.passCount, 2);
 		});
 });