diff --git a/inc/lib_filesystem.php b/inc/lib_filesystem.php
index accc133b7b6fa6a44223874b10bf34d38ad9a037..170d296bd23d3f8789f00ea56520032421cb5ca9 100644
--- a/inc/lib_filesystem.php
+++ b/inc/lib_filesystem.php
@@ -125,7 +125,7 @@ class OC_FILESYSTEM{
 		if(substr($path,0,1)!=='/'){
 			$path='/'.$path;
 		}
-		if(strstr($path,'/../')){
+		if(strstr($path,'/../') || strrchr($path, '/') === '/..' ){
 			return false;
 		}
 		return true;//dummy untill premissions are correctly implemented, also the correcty value because for now users are locked in their seperate data dir and can read/write everything in there