diff --git a/plinth/modules/radicale/__init__.py b/plinth/modules/radicale/__init__.py
index f8b355615..3910d0f08 100644
--- a/plinth/modules/radicale/__init__.py
+++ b/plinth/modules/radicale/__init__.py
@@ -45,7 +45,7 @@ class RadicaleApp(app_module.App):
 
     app_id = 'radicale'
 
-    _version = 5
+    _version = 6
 
     def __init__(self) -> None:
         """Create components for the app."""
diff --git a/plinth/modules/radicale/privileged.py b/plinth/modules/radicale/privileged.py
index 75e9bfe17..546150125 100644
--- a/plinth/modules/radicale/privileged.py
+++ b/plinth/modules/radicale/privileged.py
@@ -24,6 +24,7 @@ def setup():
     """
     aug = load_augeas()
     aug.set('auth/type', 'remote_user')
+    aug.set('auth/lc_username', 'True')
     aug.save()
     # Service is started again by socket.
     action_utils.service_stop(SERVICE_NAME)