diff --git a/test/unit/i18n_test.rb b/test/unit/i18n_test.rb
index 8e2dbda..b0ddbe5 100644
--- a/test/unit/i18n_test.rb
+++ b/test/unit/i18n_test.rb
@@ -18,7 +18,7 @@ class I18nTest < ActiveSupport::TestCase
 
   def test_locales_validness
     lang_files_count = Dir[Rails.root.join('plugins/redmine_messenger/config/locales/*.yml')].size
-    assert_equal lang_files_count, 4
+    assert_equal lang_files_count, 5
     valid_languages.each do |lang|
       assert set_language_if_valid(lang)
     end