diff --git a/lib/app.php b/lib/app.php
index 28757735e04daaa81022f406e645efa93fa5bf4b..c9329df91d1754923b047c7589014fb927761a76 100755
--- a/lib/app.php
+++ b/lib/app.php
@@ -685,6 +685,10 @@ class OC_App{
 	 * @param string $appid
 	 */
 	public static function updateApp($appid) {
+		if(file_exists(self::getAppPath($appid).'/appinfo/preupdate.php')) {
+			self::loadApp($appid);
+			include self::getAppPath($appid).'/appinfo/preupdate.php';
+		}
 		if(file_exists(self::getAppPath($appid).'/appinfo/database.xml')) {
 			OC_DB::updateDbFromStructure(self::getAppPath($appid).'/appinfo/database.xml');
 		}