diff --git a/runtests.py b/runtests.py
index e6e1703..1daf7a2 100644
--- a/runtests.py
+++ b/runtests.py
@@ -48,7 +48,7 @@
                 },
             },
         ],
-        DEFAULT_AUTO_FIELD='django.db.models.BigAutoField',
+        DEFAULT_AUTO_FIELD='django.db.models.AutoField',
         ROOT_URLCONF='boundaries.urls',
     )
     django.setup()
diff --git a/settings.py b/settings.py
index 1892aab..3b8065e 100644
--- a/settings.py
+++ b/settings.py
@@ -50,7 +50,7 @@
     },
 ]
 
-DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
+DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'
 
 if 'GDAL_LIBRARY_PATH' in os.environ:
     GDAL_LIBRARY_PATH = os.getenv('GDAL_LIBRARY_PATH')