Substitution gets broken when mapped

Hello.

I'm lost: one same substitution command works fine if executed from the
command line, but gets broken if executed via a mapping.

To remove trailing spaces I do:

:%s/\s\+$//

And it works perfectly. Since it's such a useful command I add this
mapping to my .vimrc:

nmap <leader>w :%s/\s\+$// <cr>

But when I use the mapping, many extra lines get deleted and the text is
mangled.

I expect the mapping to yield the same result as the direct command, but
it doesn't. What gives?

Sylvia

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