diff --git a/app/controllers/settings_controller.rb b/app/controllers/settings_controller.rb
index 229a4ab..fd094ad 100644
--- a/app/controllers/settings_controller.rb
+++ b/app/controllers/settings_controller.rb
@@ -29,5 +29,6 @@ class SettingsController < ApplicationController
       params[:settings].each { |name, value| Setting[name] = value }
       redirect_to :action => 'edit' and return
     end
+    @textile_available = ActionView::Helpers::TextHelper.method_defined?("textilize")
   end
 end
diff --git a/app/views/settings/edit.rhtml b/app/views/settings/edit.rhtml
index 4c9b550..057a988 100644
--- a/app/views/settings/edit.rhtml
+++ b/app/views/settings/edit.rhtml
@@ -37,7 +37,7 @@
 <%= text_field_tag 'settings[host_name]', Setting.host_name, :size => 60 %></p>
 
 <p><label><%= l(:setting_text_formatting) %></label>
-<%= select_tag 'settings[text_formatting]', options_for_select( [[l(:label_none), 0], ["textile", "textile"]], Setting.text_formatting) %></p>
+<%= select_tag 'settings[text_formatting]', options_for_select([[l(:label_none), 0], ["textile", "textile"]], (@textile_available ? Setting.text_formatting : 0)), :disabled => !@textile_available %></p>
 
 <p><label><%= l(:setting_wiki_compression) %></label>
 <%= select_tag 'settings[wiki_compression]', options_for_select( [[l(:label_none), 0], ["gzip", "gzip"]], Setting.wiki_compression) %></p>