Applying a patch with a diff header in its commit message

Hi,

I have a patch at $DAYJOB that contains a diff header ("diff --git a/...") in its commit message, and unfortunately it is not indented. So naturally, git-am trips up and thinks it is the start of the main diff and tries to apply the diff starting there. It does not apply and the patch is rejected as being corrupt.

I know one option for me is to manually edit the patch and indent the diff header. But I would like to avoid that if possible. Is there any way to apply that patch as-is? Is it possible to tell git-am where to start looking for the diff?