diff --git a/rest_framework_idempotency_key/migrations/0003_remove_user.py b/rest_framework_idempotency_key/migrations/0003_remove_user.py
index eefd241..7e4253b 100644
--- a/rest_framework_idempotency_key/migrations/0003_remove_user.py
+++ b/rest_framework_idempotency_key/migrations/0003_remove_user.py
@@ -10,14 +10,19 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.RemoveField(
+        migrations.AlterField(
             model_name='idempotencykey',
             name='user',
+            field=models.IntegerField(null=True),
         ),
         migrations.RemoveConstraint(
             model_name='idempotencykey',
             name='Unique IdempotencyKey (user, idempotency_key)',
         ),
+        migrations.RemoveField(
+            model_name='idempotencykey',
+            name='user',
+        ),
         migrations.AddConstraint(
             model_name='idempotencykey',
             constraint=models.UniqueConstraint(