diff --git a/plinth/modules/users/tests/test_functional.py b/plinth/modules/users/tests/test_functional.py
index 0ccfb2fed..4400833d3 100644
--- a/plinth/modules/users/tests/test_functional.py
+++ b/plinth/modules/users/tests/test_functional.py
@@ -57,7 +57,7 @@ def fixture_background(session_browser):
     """Login."""
     functional.login(session_browser)
     yield
-    _set_language(session_browser, _language_codes['None'])
+    functional.user_set_language(session_browser, _language_codes['None'])
 
 
 def test_create_user(session_browser):
@@ -146,7 +146,7 @@ def test_update_user(session_browser):
 @pytest.mark.parametrize('language_code', _language_codes.values())
 def test_change_language(session_browser, language_code):
     """Test changing the language."""
-    _set_language(session_browser, language_code)
+    functional.user_set_language(session_browser, language_code)
     assert _check_language(session_browser, language_code)
 
 
@@ -298,15 +298,6 @@ def _get_email(browser, username):
     return browser.find_by_id('id_email').value
 
 
-def _set_language(browser, language_code):
-    username = functional.config['DEFAULT']['username']
-    functional.visit(browser, '/plinth/sys/users/{}/edit/'.format(username))
-    browser.find_by_xpath('//select[@id="id_language"]//option[@value="' +
-                          language_code + '"]').first.click()
-    browser.find_by_id('id_confirm_password').fill(_admin_password)
-    functional.submit(browser, form_class='form-update')
-
-
 def _check_language(browser, language_code):
     functional.nav_to_module(browser, 'config')
     return browser.find_by_css('.app-titles').first.find_by_tag(
diff --git a/plinth/tests/functional/__init__.py b/plinth/tests/functional/__init__.py
index 2d652646d..3f771404f 100644
--- a/plinth/tests/functional/__init__.py
+++ b/plinth/tests/functional/__init__.py
@@ -679,6 +679,17 @@ def user_exists(browser, name):
     return len(links) == 1
 
 
+def user_set_language(browser, language_code):
+    """Change user's preferred UI language."""
+    username = config['DEFAULT']['username']
+    admin_password = config['DEFAULT']['password']
+    visit(browser, '/plinth/sys/users/{}/edit/'.format(username))
+    browser.find_by_xpath('//select[@id="id_language"]//option[@value="' +
+                          language_code + '"]').first.click()
+    browser.find_by_id('id_confirm_password').fill(admin_password)
+    submit(browser, form_class='form-update')
+
+
 class BaseAppTests:
     """Base class for common functional tests.