diff --git a/preferences/inc/class.preferences_settings.inc.php b/preferences/inc/class.preferences_settings.inc.php
index f9d5957b2f..0843ae86cd 100644
--- a/preferences/inc/class.preferences_settings.inc.php
+++ b/preferences/inc/class.preferences_settings.inc.php
@@ -121,9 +121,13 @@ class preferences_settings
 			$msg = $this->process_array($GLOBALS['egw']->preferences->$attribute,
 				(array)$GLOBALS['egw']->preferences->{$attribute}[$appname], $preserve['types'], $appname, $attribute, true);
 		}
-		// get sidebox of given app
-		if ($appname != 'common') $GLOBALS['egw_info']['flags']['currentapp'] = $appname;
-
+		// get sidebox menu of given app
+		if ($appname != 'common')
+		{
+			$GLOBALS['egw_info']['flags']['currentapp'] = $appname;
+			// need to include our css
+			egw_framework::includeCSS('preferences','app');
+		}
 		if ($msg) egw_framework::message($msg, $msg_type ? $msg_type : 'error');
 
 		$tpl->exec('preferences.preferences_settings.index', $content, $sel_options, $readonlys, $preserve);