diff --git a/app/views/workflows/permissions.html.erb b/app/views/workflows/permissions.html.erb
index 2c52986..bd27115 100644
--- a/app/views/workflows/permissions.html.erb
+++ b/app/views/workflows/permissions.html.erb
@@ -65,7 +65,7 @@
           <%=h name %> <%= content_tag('span', '*', :class => 'required') if field_required?(field) %>
         </td>
         <% for status in @statuses -%>
-        <td class="<%= @permissions[status.id][field] %>">
+        <td class="<%= @permissions[status.id][field].try(:join, ' ') %>">
           <%= field_permission_tag(@permissions, status, field, @roles) %>
           <% unless status == @statuses.last %><a href="#" class="repeat-value">&#187;</a><% end %>
         </td>
diff --git a/test/functional/workflows_controller_test.rb b/test/functional/workflows_controller_test.rb
index 85e0a1c..d59614a 100644
--- a/test/functional/workflows_controller_test.rb
+++ b/test/functional/workflows_controller_test.rb
@@ -257,6 +257,15 @@ class WorkflowsControllerTest < ActionController::TestCase
     assert_equal IssueStatus.sorted.to_a, assigns(:statuses)
   end
 
+  def test_get_permissions_should_set_css_class
+    WorkflowPermission.delete_all
+    WorkflowPermission.create!(:role_id => 1, :tracker_id => 2, :old_status_id => 1, :field_name => 'assigned_to_id', :rule => 'required')
+
+    get :permissions, :role_id => 1, :tracker_id => 2
+    assert_response :success
+    assert_select 'td.required > select[name=?]', 'permissions[1][assigned_to_id]'
+  end
+
   def test_post_permissions
     WorkflowPermission.delete_all