diff --git a/test/spec/request-test.js b/test/spec/request-test.js
index 646897b..2a2120d 100644
--- a/test/spec/request-test.js
+++ b/test/spec/request-test.js
@@ -208,7 +208,7 @@ describe('Request-Promise', function () {
         var cookiejar = rp.jar();
 
         expect(function () {
-            cookiejar.setCookie(sessionCookie, 'https://api.mydomain.com');
+            cookiejar.setCookie(sessionCookie.toString(), 'https://api.mydomain.com');
         }).to.not.throw();
 
     });