[Maxximou5]

Define what "it" is, what variable are you setting.
Also, you are referring to gamemode_x_server.cfg and not a mistype in server.cfg, correct?
The games own, by that you mean Valve's end of match vote?

If it's Valve's, you need only set mp_endmatch_votenextmap "0" in your gamemode_x_server.cfg

x = gamemode + gametype (e.g. casual, competitive, deathmatch, etc)