diff --git a/plinth/modules/nextcloud/tests/test_functional.py b/plinth/modules/nextcloud/tests/test_functional.py
index b98bd7f64..6c8833162 100644
--- a/plinth/modules/nextcloud/tests/test_functional.py
+++ b/plinth/modules/nextcloud/tests/test_functional.py
@@ -23,8 +23,10 @@ class TestNextcloudApp(functional.BaseAppTests):
         super().install_and_setup(session_browser)
         functional.app_enable(session_browser, self.app_name)
         default_url = functional.config['DEFAULT']['url']
-        hostname = urllib.parse.urlparse(default_url).hostname
-        session_browser.find_by_id('id_override_domain').fill(hostname)
+        parse_result = urllib.parse.urlparse(default_url)
+        override_domain = parse_result.hostname
+        override_domain += f':{parse_result.port}' if parse_result.port else ''
+        session_browser.find_by_id('id_override_domain').fill(override_domain)
         session_browser.find_by_id('id_admin_password').fill(PASSWORD)
         functional.submit(session_browser, form_class='form-configuration')