diff --git a/wagtail_localize/apps.py b/wagtail_localize/apps.py
index 02ca774b..9fd08d99 100644
--- a/wagtail_localize/apps.py
+++ b/wagtail_localize/apps.py
@@ -5,6 +5,7 @@ class WagtailLocalizeAppConfig(AppConfig):
     name = 'wagtail_localize'
     label = 'wagtail_localize'
     verbose_name = "Wagtail localize"
+    default_auto_field = 'django.db.models.AutoField'
 
     def ready(self):
         from .models import register_post_delete_signal_handlers