diff --git a/test/unit/issue_test.rb b/test/unit/issue_test.rb
index 5352fb790..2ac08cec3 100644
--- a/test/unit/issue_test.rb
+++ b/test/unit/issue_test.rb
@@ -31,6 +31,10 @@ class IssueTest < ActiveSupport::TestCase
 
   include Redmine::I18n
 
+  def setup
+    set_language_if_valid 'en'
+  end
+
   def teardown
     User.current = nil
   end