diff --git a/modules/routes/routeSecurityLocal.py b/modules/routes/routeSecurityLocal.py
index 608528d8..6d2ffd73 100644
--- a/modules/routes/routeSecurityLocal.py
+++ b/modules/routes/routeSecurityLocal.py
@@ -121,12 +121,20 @@ async def register_user(userData: User):
         # Get gateway interface
         appInterface = getInterface()
         
-        # Create user
+        # Get default mandate ID
+        defaultMandateId = appInterface.getInitialId("mandates")
+        if not defaultMandateId:
+            raise HTTPException(
+                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+                detail="No default mandate found"
+            )
+        
+        # Create user with default mandate
         user = appInterface.createUser(
             username=userData.username,
             password=userData.password,
             email=userData.email,
-            mandateId=userData.mandateId,
+            mandateId=defaultMandateId,  # Use default mandate instead of userData.mandateId
             authenticationAuthority=AuthAuthority.LOCAL
         )