Partner's switch taken STP root on a few of my VLANs

Hi all,

I noticed the other day that a partner's switch has taken STP root on a couple of my VLANS. Specifically ethernet port 1/1/4 with a priority of 4096.

Someone suggested to me that i enable STP root guard. But after adding:

spanning-tree guard root 

on that port i do not see any change. I suspect that is not the right command?