diff --git a/lib/installer.php b/lib/installer.php
index bdbff3673b..6417ed1c7a 100644
--- a/lib/installer.php
+++ b/lib/installer.php
@@ -345,7 +345,7 @@ class OC_Installer{
         public static function checkCode($appname,$folder){
 
 		$blacklist=array(
-			'fopen(',
+			'exec(',
 			'eval('
 			// more evil pattern will go here later
 			// will will also check if an app is using private api once the public api is in place