Using ssh-host in ssh.el mode hook?

[Felix E. Klee]

Hi,

in order to get file name completion via Tramp I added the following code to 
the mode hook of ssh mode:
  (lambda () (setq comint-file-name-prefix (concat "/ssh:" ssh-host ":")))
However, ssh-host does not seem to be defined at the time the mode hook is 
applied. Therefore, after starting an ssh session to somehost, 
comint-file-name-prefix contains "/ssh::" instead of "/ssh:somehost:".

Any ideas how to solve this problem?

Felix