[p4] file added with wrong permissions, how to change?

[mikee]

I submitted a file (file.csh) as 644 and it needs to be 755.
To try and fix this I did:

$ p4 open file.csh
$ chmod 755 file.csh
$ p4 reopen file.csh
$ p4 submit

then

$ p4 sync ./...

The file still had the wrong permissions. What's the right
way to fix bad permissions?

Mike