diff --git a/verify_email/apps.py b/verify_email/apps.py
index 83b2c79..f424d49 100644
--- a/verify_email/apps.py
+++ b/verify_email/apps.py
@@ -7,6 +7,7 @@
 
 class VerifyEmailConfig(AppConfig):
     name = 'verify_email'
+    default_auto_field = 'django.db.models.BigAutoField'
 
     def ready(self):
         logger.info('[Email Verification] : importing signals    - OK.')