diff --git a/install_mysql-5.7.sh b/install_mysql-5.7.sh
index 0198a16..19efdc4 100755
--- a/install_mysql-5.7.sh
+++ b/install_mysql-5.7.sh
@@ -2503,7 +2503,7 @@ if ! $UPDATE_MYSQL || $_sys_maint_cnf_needed ; then
    fi
 
 
-   echononl "Erstelle ${MYSQL_INSTALL_DIR}/sys-maint.cnf.." 
+   echononl "Erstelle '${MYSQL_INSTALL_DIR}/sys-maint.cnf'.." 
    cat << EOF > ${MYSQL_INSTALL_DIR}/sys-maint.cnf
 [client]
 host     = localhost
@@ -2526,6 +2526,7 @@ EOF
 fi
 
 
+sys_maint_file="$(dirname $MYSQL_INSTALL_DIR)/mysql/sys-maint.cnf"
 echononl "Erstelle Logrotate Definitionsdatei /etc/logrotate.d/mysql.."
 cat << EOF > /etc/logrotate.d/mysql
 $_mysql_log
@@ -2539,9 +2540,9 @@ $_mysql_slow_query_log
    compress
    sharedscripts
    postrotate
-      MYSQL="`dirname $MYSQL_INSTALL_DIR`/mysql/bin/mysql --defaults-file=${MYSQL_INSTALL_DIR}/sys-maint.cnf"
-      MYADMIN="`dirname $MYSQL_INSTALL_DIR`/mysql/bin/mysqladmin --defaults-file=${MYSQL_INSTALL_DIR}/sys-maint.cnf"
-      if [ -z "\`\$MYADMIN ping 2>/dev/null\`" ]; then
+      MYSQL="$(dirname $MYSQL_INSTALL_DIR)/mysql/bin/mysql --defaults-file=$sys_maint_file"
+      MYADMIN="$(dirname $MYSQL_INSTALL_DIR)/mysql/bin/mysqladmin --defaults-file=$sys_maint_file"
+      if [ -z "\$(\$MYADMIN ping 2>/dev/null)" ]; then
          echo "Warning: no mysqld running or missing sys-maint user?"
       else
          \$MYSQL -e 'select @@global.long_query_time into @lqt_save; set global long_query_time=2000; select sleep(2); FLUSH LOGS; select sleep(2); set global long_query_time=@lqt_save;' > /dev/null