diff --git a/types/angular-promise-tracker/angular-promise-tracker-tests.ts b/types/angular-promise-tracker/angular-promise-tracker-tests.ts
index 82f9e66c06..0365709cf5 100644
--- a/types/angular-promise-tracker/angular-promise-tracker-tests.ts
+++ b/types/angular-promise-tracker/angular-promise-tracker-tests.ts
@@ -1,7 +1,7 @@
 angular.module('promise-tracker-tests', []).run(['$q', 'promiseTracker',
     ($q: angular.IQService, promiseTracker: angular.promisetracker.PromiseTrackerService) => {
         const trackerWithoutOptions = promiseTracker();
-        
+
         const options = {
             activationDelay: 10,
             minDuration: 500
@@ -17,4 +17,6 @@ angular.module('promise-tracker-tests', []).run(['$q', 'promiseTracker',
 
         const promiseToAdd = $q.defer().promise;
         const addedPromise: angular.IDeferred<void> = trackerWithOptions.addPromise(promiseToAdd);
+
+        const trackerWithSomeOptions = promiseTracker({activationDelay: 500});
 }]);
diff --git a/types/angular-promise-tracker/index.d.ts b/types/angular-promise-tracker/index.d.ts
index c00f36e77c..b8957eab3d 100644
--- a/types/angular-promise-tracker/index.d.ts
+++ b/types/angular-promise-tracker/index.d.ts
@@ -10,8 +10,8 @@ import * as angular from 'angular';
 declare module 'angular' {
     export namespace promisetracker {
         interface PromiseTrackerOptions {
-            activationDelay: number;
-            minDuration: number;
+            activationDelay?: number;
+            minDuration?: number;
         }
 
         interface PromiseTracker {