diff --git a/django_mailbox/apps.py b/django_mailbox/apps.py
index 13b7bf3..4e6894c 100644
--- a/django_mailbox/apps.py
+++ b/django_mailbox/apps.py
@@ -3,5 +3,6 @@ from django.utils.translation import gettext_lazy as _
 
 
 class MailBoxConfig(AppConfig):
+    default_auto_field = 'django.db.models.AutoField'
     name = 'django_mailbox'
     verbose_name = _("Mail Box")
diff --git a/tox.ini b/tox.ini
index 90678d6..db658ad 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,6 +8,7 @@ envlist=
     py{35,36,37}-django22
     py{36,37,38}-django30
     py{36,37,38}-django31
+    py{36,37,38}-django32
 
 [testenv]
 passenv=EMAIL_IMAP_SERVER EMAIL_ACCOUNT EMAIL_PASSWORD EMAIL_SMTP_SERVER
@@ -18,6 +19,7 @@ deps=
     django22: django==2.0.*
     django30: django==3.0.*
     django31: django==3.1.*
+    django32: django==3.2.*
     -r{toxinidir}/test_requirements.txt
 sitepackages=False
 commands=