diff --git a/doc/rpm-build/post_install.php b/doc/rpm-build/post_install.php
index d90765f739..991823f957 100755
--- a/doc/rpm-build/post_install.php
+++ b/doc/rpm-build/post_install.php
@@ -550,8 +550,8 @@ function randomstring($len=16)
 		'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
 		'w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L',
 		'M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
-		'@','!','%','&','(',')','=','?',';',':','#','_','-','<',
-		'>','|','[',']','}',	// dont add /\,'"{ as we have problems dealing with them
+		'@','!','&','(',')','=','?',';',':','#','_','-','<',
+		'>','|','[',']','}',	// dont add %, /\,'"{ as we have problems dealing with them
 	);
 
 	// use cryptographically secure random_int available in PHP 7+
@@ -666,7 +666,7 @@ function set_univention_defaults()
 
 		$config['account_min_id'] = 1200;	// UCS use 11xx for internal users/groups
 
-		$config['account-auth'] = 'univention,ldap';
+		$config['account-auth'] = 'univention,univention';
 
 		// set sambaadmin sambaSID
 		$config['sambaadmin/sambasid'] = exec('/usr/bin/univention-ldapsearch -x "(objectclass=sambadomain)" sambaSID|sed -n "s/sambaSID: \(.*\)/\1/p"');