diff --git a/cashonly/core/apps.py b/cashonly/core/apps.py
index 0006ff0..6480c09 100644
--- a/cashonly/core/apps.py
+++ b/cashonly/core/apps.py
@@ -4,3 +4,4 @@ from django.apps import AppConfig
 class CashonlyCoreConfig(AppConfig):
     name = "cashonly.core"
     label = "cashonly_core"
+    default_auto_field = "django.db.models.AutoField"
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