Remote P4 files don't work

[skwiffhub]

Attempting something like C-x p e (i.e. p4 edit) on a remote file opened using Tramp in emacs does not seem to work. If the file was opened with C-x C-f /ssh:user@host:/home/user/myFile.c, then running C-x p e on it results in Invalid changelist/client/label/date @host:/home/user/myFile.c since it evidently thinks the @ in the remote file path is a changelist number.