diff --git a/modoboa/core/commands/templates/settings.py.tpl b/modoboa/core/commands/templates/settings.py.tpl
index 243658309..a404ca01d 100644
--- a/modoboa/core/commands/templates/settings.py.tpl
+++ b/modoboa/core/commands/templates/settings.py.tpl
@@ -191,6 +191,7 @@ REST_FRAMEWORK = {
         'rest_framework.authentication.TokenAuthentication',
         'rest_framework.authentication.SessionAuthentication',
     ),
+    'DEFAULT_SCHEMA_CLASS': 'drf_spectacular.openapi.AutoSchema',
 }
 
 SPECTACULAR_SETTINGS = {