diff --git a/actions/quassel b/actions/quassel
deleted file mode 100755
index c22e14c5e..000000000
--- a/actions/quassel
+++ /dev/null
@@ -1,40 +0,0 @@
-#!/usr/bin/python3
-# SPDX-License-Identifier: AGPL-3.0-or-later
-"""
-Configuration helper for Quassel.
-"""
-
-import argparse
-import pathlib
-
-
-def parse_arguments():
-    """Return parsed command line arguments as dictionary."""
-    parser = argparse.ArgumentParser()
-    subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')
-
-    subparser = subparsers.add_parser('set-domain',
-                                      help='Setup Quassel configuration')
-    subparser.add_argument('domain_name', help='Domain name to be allowed')
-
-    subparsers.required = True
-    return parser.parse_args()
-
-
-def subcommand_set_domain(arguments):
-    """Write a file containing domain name."""
-    domain_file = pathlib.Path('/var/lib/quassel/domain-freedombox')
-    domain_file.write_text(arguments.domain_name, encoding='utf-8')
-
-
-def main():
-    """Parse arguments and perform all duties."""
-    arguments = parse_arguments()
-
-    subcommand = arguments.subcommand.replace('-', '_')
-    subcommand_method = globals()['subcommand_' + subcommand]
-    subcommand_method(arguments)
-
-
-if __name__ == '__main__':
-    main()
diff --git a/plinth/modules/quassel/__init__.py b/plinth/modules/quassel/__init__.py
index 0405e9cb9..284e67642 100644
--- a/plinth/modules/quassel/__init__.py
+++ b/plinth/modules/quassel/__init__.py
@@ -1,14 +1,11 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
-"""
-FreedomBox app for Quassel.
-"""
+"""FreedomBox app for Quassel."""
 
 import pathlib
 
 from django.urls import reverse_lazy
 from django.utils.translation import gettext_lazy as _
 
-from plinth import actions
 from plinth import app as app_module
 from plinth import cfg, frontpage, menu
 from plinth.daemon import Daemon
@@ -20,7 +17,7 @@ from plinth.modules.users.components import UsersAndGroups
 from plinth.package import Packages
 from plinth.utils import format_lazy
 
-from . import manifest
+from . import manifest, privileged
 
 _description = [
     format_lazy(
@@ -108,7 +105,7 @@ class QuasselApp(app_module.App):
 def set_domain(domain):
     """Set the TLS domain by writing a file to data directory."""
     if domain:
-        actions.superuser_run('quassel', ['set-domain', domain])
+        privileged.set_domain(domain)
 
 
 def get_domain():
diff --git a/plinth/modules/quassel/privileged.py b/plinth/modules/quassel/privileged.py
new file mode 100644
index 000000000..bab66e9dd
--- /dev/null
+++ b/plinth/modules/quassel/privileged.py
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""Configure Quassel."""
+
+import pathlib
+
+from plinth.actions import privileged
+
+
+@privileged
+def set_domain(domain_name: str):
+    """Write a file containing domain name."""
+    domain_file = pathlib.Path('/var/lib/quassel/domain-freedombox')
+    domain_file.write_text(domain_name, encoding='utf-8')