diff --git a/shortener/apps.py b/shortener/apps.py
index 84b0a39..677de68 100644
--- a/shortener/apps.py
+++ b/shortener/apps.py
@@ -3,3 +3,5 @@
 
 class ShortenerConfig(AppConfig):
     name = 'shortener'
+
+    default_auto_field = "django.db.models.BigAutoField"