Disabling "Remember password" for GKSU command

I am using GKSU for switching user in my Linux terminal and I want to disable "Remember password" option in that Pop-up menu due to security reasons. I am not sure how to achieve that. Mentioned below is the only trial i tried in the system, which did not work too. gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type bool --set /apps/gksu/save-to-keyring false System config: Os : Debian 8 Desktop Environment : LXDE Command used for this operation : gksu -u test /usr/bin/xterm Attached screenshot for the same I remember password option to be completely disabled