diff --git a/common.php b/common.php
index 494299ac8..76a8d97d7 100644
--- a/common.php
+++ b/common.php
@@ -373,7 +373,7 @@ function make_rand_str ($len = 10)
 	$str = '';
 	while (strlen($str) < $len)
 	{
-		$str .= str_shuffle(preg_replace('#[^0-9a-zA-Z]#', '', crypt(uniqid(mt_rand(), true))));
+		$str .= str_shuffle(preg_replace('#[^0-9a-zA-Z]#', '', password_hash(uniqid(mt_rand(), true), PASSWORD_BCRYPT)));
 	}
 	return substr($str, 0, $len);
 }