diff --git a/NEMbox/api.py b/NEMbox/api.py
index 3d029cd7..2b9bf9f3 100644
--- a/NEMbox/api.py
+++ b/NEMbox/api.py
@@ -347,7 +347,7 @@ def make_cookie(self, name, value):
             rest=None,
         )
 
-    def request(self, method, path, params={}, default={"code": -1}, custom_cookies={}):
+    def request(self, method, path, params={}, default={"code": -1}, custom_cookies={'os':'pc'}):
         endpoint = "{}{}".format(BASE_URL, path)
         csrf_token = ""
         for cookie in self.session.cookies: