diff --git a/main/inc/lib/security.lib.php b/main/inc/lib/security.lib.php
index 3177989630..c9b614e888 100755
--- a/main/inc/lib/security.lib.php
+++ b/main/inc/lib/security.lib.php
@@ -68,7 +68,7 @@ class Security{
 		}
 		$abs_path = $current_path.$rel_path;
 		$true_path = realpath($abs_path);
-		$found = strpos($true_path.'/',$checker_path,strlen($checker_path));
+		$found = strpos($true_path.'/',$checker_path);
 		if($found===0)
 		{
 			return true;
@@ -85,7 +85,7 @@ class Security{
 	{
 		if(empty($checker_path)){return false;} //checker path must be set
 		$true_path = realpath($abs_path);
-		$found = strpos($true_path.'/',$checker_path,strlen($checker_path));
+		$found = strpos($true_path.'/',$checker_path);
 		if($found===0)
 		{
 			return true;