diff --git a/upgrade_roundcube.sh b/upgrade_roundcube.sh
index 56915ba..ae25801 100755
--- a/upgrade_roundcube.sh
+++ b/upgrade_roundcube.sh
@@ -134,6 +134,8 @@ fi
 DEFAULT_DB_HOST="localhost"
 DEFAULT_DB_NAME="roundcubemail"
 DEFAULT_DB_USER="roundcube"
+DEFAULT_DEBIAN_MYSQL_CREDENTIALS="--defaults-file=/etc/mysql/debian.cnf"
+DEFAULT_MYSQL_CREDENTIALS="--defaults-file=/usr/local/mysql/sys-maint.cnf"
 
 
 echo