diff --git a/backend/app/services/interfaces/onboarding_request_service.py b/backend/app/services/interfaces/onboarding_request_service.py
index d183a95c..e3aedf13 100644
--- a/backend/app/services/interfaces/onboarding_request_service.py
+++ b/backend/app/services/interfaces/onboarding_request_service.py
@@ -50,7 +50,7 @@ def get_onboarding_request_by_id(self, id):
         """
 
     @abstractmethod
-    def approve_onboarding_request(self, id: str):
+    def approve_onboarding_request(self, id):
         """
         Approves an onboarding request