diff --git a/src/app/serializers.py b/src/app/serializers.py
index 3a84890..ba62546 100644
--- a/src/app/serializers.py
+++ b/src/app/serializers.py
@@ -8,7 +8,7 @@ from app.models import CachePrivileges, Statuses
 
 class ServiceCreate(BaseModel):
     token: constr(max_length=128)  # type: ignore
-    user: Optional[str] = None
+    user: int
     username: constr(max_length=64)  # type: ignore
     status: Statuses
     cache: CachePrivileges