diff --git a/envs/monkey_zoo/blackbox/island_client/monkey_island_requests.py b/envs/monkey_zoo/blackbox/island_client/monkey_island_requests.py
index f5ac59a1f..3f8efb227 100644
--- a/envs/monkey_zoo/blackbox/island_client/monkey_island_requests.py
+++ b/envs/monkey_zoo/blackbox/island_client/monkey_island_requests.py
@@ -75,7 +75,7 @@ class MonkeyIslandRequests(object):
     def try_set_island_to_credentials(self):
         resp = requests.post(  # noqa: DUO123
             self.addr + "api/registration",
-            json={"user": ISLAND_USERNAME, "password": ISLAND_PASSWORD},
+            json={"username": ISLAND_USERNAME, "password": ISLAND_PASSWORD},
             verify=False,
         )
         if resp.status_code == 400: