diff --git a/django/db/models/fields/related.py b/django/db/models/fields/related.py
index b80bb411cb..f88e182fde 100644
--- a/django/db/models/fields/related.py
+++ b/django/db/models/fields/related.py
@@ -246,7 +246,7 @@ class OneToOneField(RelatedField, IntegerField):
 
         self.db_index = True
 
-        for name in ('num_in_admin'):
+        for name in ('num_in_admin',):
             if name in kwargs:
                 self.deprecated_args.append(name)