diff --git a/conf/install_postfixadmin.conf.sample b/conf/install_postfixadmin.conf.sample
index 4e9846f..c18c0f1 100644
--- a/conf/install_postfixadmin.conf.sample
+++ b/conf/install_postfixadmin.conf.sample
@@ -42,7 +42,7 @@ IPV6=""
 # -
 #WEBMASTER_EMAIL=""
 
-# - Base Directory of Roundcube Website 
+# - Base Directory of postfixadmin Website 
 # -
 # - Note: it's not the 'DocumentRoot' directory, but the directory where
 # -       the 'DocumentRoot' Directory lives.
@@ -69,7 +69,7 @@ IPV6=""
 # -
 APACHE_CERT_DIR=""
 
-# - Certificate for the Rounfcube Website
+# - Certificate for the postfixadmin Website
 # -
 # - Example:
 # -    APACHE_SERVER_CERT="fullchain.pem"
@@ -142,8 +142,8 @@ APACHE_SERVER_KEY=""
 # -    mysql_credential_args="--defaults-file=/usr/local/mysql/sys-maint.cnf"
 # -
 # - Defaults to:
-# -    '/etc/mysql/debian.cnf' if MySQL is installed from debian package system
-# -    '/usr/local/mysql/sys-maint.cnf' otherwise
+# -    '--defaults-file=//etc/mysql/debian.cnf' if MySQL is installed from debian package system
+# -    '--defaults-file=//usr/local/mysql/sys-maint.cnf' otherwise
 # -
 #MYSQL_CREDENTIALS=""
 
diff --git a/install_postfixadmin.sh b/install_postfixadmin.sh
index ee239ca..adfc8c1 100755
--- a/install_postfixadmin.sh
+++ b/install_postfixadmin.sh
@@ -224,8 +224,8 @@ DEFAULT_POSTFIX_DB_HOST="localhost"
 DEFAULT_POSTFIX_DB_NAME="postfix"
 DEFAULT_POSTFIX_DB_USER="postfix"
 DEFAULT_POSTFIX_DB_SOCKET_PG="/var/run/postgresql"
-DEFAULT_DEBIAN_MYSQL_CREDENTIALS="/etc/mysql/debian.cnf"
-DEFAULT_MYSQL_CREDENTIALS="/usr/local/mysql/sys-maint.cnf"
+DEFAULT_DEBIAN_MYSQL_CREDENTIALS="--defaults-file=/etc/mysql/debian.cnf"
+DEFAULT_MYSQL_CREDENTIALS="--defaults-file=/usr/local/mysql/sys-maint.cnf"
 
 DEFAULT_DOVEADM_PW="/usr/local/dovecot/bin/doveadm pw"
 DEFAULT_DELETED_MAILBOX_DIR="/var/deleted-maildirs"