diff --git a/app/controllers/application.rb b/app/controllers/application.rb
index a6d881ff..3644c396 100644
--- a/app/controllers/application.rb
+++ b/app/controllers/application.rb
@@ -59,6 +59,7 @@ class ApplicationController < ActionController::Base
   end 
   
   def set_localization
+    User.current.language = nil unless User.current.logged?
     lang = begin
       if !User.current.language.blank? and GLoc.valid_languages.include? User.current.language.to_sym
         User.current.language
diff --git a/test/integration/application_test.rb b/test/integration/application_test.rb
new file mode 100644
index 00000000..18f4891c
--- /dev/null
+++ b/test/integration/application_test.rb
@@ -0,0 +1,43 @@
+# redMine - project management software
+# Copyright (C) 2006-2008  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+require "#{File.dirname(__FILE__)}/../test_helper"
+
+class ApplicationTest < ActionController::IntegrationTest
+  fixtures :users
+  
+  def test_set_localization
+    Setting.default_language = 'en'
+    
+    # a french user
+    get 'projects', { }, 'Accept-Language' => 'fr,fr-fr;q=0.8,en-us;q=0.5,en;q=0.3'
+    assert_response :success
+    assert_tag :tag => 'h2', :content => 'Projets'
+    assert_equal 'fr', User.current.language
+    
+    # then an italien user
+    get 'projects', { }, 'Accept-Language' => 'it;q=0.8,en-us;q=0.5,en;q=0.3'
+    assert_response :success
+    assert_tag :tag => 'h2', :content => 'Progetti'
+    assert_equal 'it', User.current.language
+    
+    # not a supported language: default language should be used
+    get 'projects', { }, 'Accept-Language' => 'zz'
+    assert_response :success
+    assert_tag :tag => 'h2', :content => 'Projects'
+  end
+end