Anti suicide script not working?

[Chizbang]

I found this somewhere on Facepunch from a few years ago:

function GM:CanPlayerSuicide(ply)
return false
end

I put that in a file named antisuicide.lua in lua/autorun/server/ but its not working. I can still suicide though... Whats up?
Do I need some sort of hook?

[Shinycow]

You can't call the gamemode table outside of the gamemode.

Replace the code with this instead:

[lua]
hook.Add("CanPlayerSuicide", "antisuicide", function( ply )
return false
end)
[/lua]