diff --git a/lib/base.php b/lib/base.php
index f8f9362a64..231819b36a 100644
--- a/lib/base.php
+++ b/lib/base.php
@@ -287,7 +287,7 @@ class OC{
 		if(file_exists(OC::$APPSROOT . '/apps/' . OC::$REQUESTEDAPP . '/' . OC::$REQUESTEDFILE)){
 			require_once(OC::$APPSROOT . '/apps/' . OC::$REQUESTEDAPP . '/' . OC::$REQUESTEDFILE);
 		}else{
-			echo "WTF";
+			header('404 Not Found')
 		}
 	}