diff --git a/install_mysql.sh b/install_mysql.sh
index 933b738..336ea0a 100755
--- a/install_mysql.sh
+++ b/install_mysql.sh
@@ -5063,6 +5063,32 @@ if $INSTALL_SYSTEMD_SERVICE ; then
       [[ $OK = "yes" ]] || fatal "Abbruch durch User"
    fi
 
+
+   echononl "Add '--defaults-file=..' to ExecStart command line at systemd service file.."
+   echo "" >> ${logdir}/main.log
+   echo "## - Add '--defaults-file=..' to ExecStart command line at systemd service file.." >> ${logdir}/main.log
+   echo "## -" >> ${logdir}/main.log
+   echo "perl -i -n -p -e \"s&^(\s*ExecStart=[^\s]+)\s+(.*)&\1 --defaults-file=${MYSQL_INSTALL_DIR}/etc/my.cnf \2&\"  /etc/systemd/system/$MYSQL_SERVICE_FILE" >> ${logdir}/main.log
+
+   perl -i -n -p -e "s&^(\s*ExecStart=[^\s]+)\s+(.*)&\1 --defaults-file=${MYSQL_INSTALL_DIR}/etc/my.cnf \2&" \
+      /etc/systemd/system/$MYSQL_SERVICE_FILE >> ${logdir}/main.log
+   if [[ $_retval -eq 0 ]]; then
+      echo_ok
+   else
+      echo_failed
+      error "Modifiing ExecStart command line at '/etc/systemd/system/${MYSQL_SERVICE_FILE}' failed!"
+
+      echononl "continue anyway [yes/no]: "
+      read OK
+      OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+      while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+         echononl "Wrong entry! - repeat [yes/nno]: "
+         read OK
+      done
+      [[ $OK = "yes" ]] || fatal "Abbruch durch User"
+   fi
+
+
    echononl "Set open_files_limit (LimitNOFILE) to $(ulimit -Hn) .."
    echo "" >> ${logdir}/main.log
    echo "## - Set open_files_limit (LimitNOFILE) to $(ulimit -Hn) .." >> ${logdir}/main.log