Custom ido bindings stop working with Smex installed

[auwsmit]

So I'm using this snippet:

(define-key ido-common-completion-map "\C-j" 'ido-next-match)
(define-key ido-common-completion-map "\C-k" 'ido-prev-match)
(define-key ido-file-completion-map "\C-k" 'ido-prev-match)
(define-key ido-buffer-completion-map "\C-k" 'ido-prev-match)

to more easily navigate through results in ido (especially with vertical-ido-mode). When I install Smex, the bindings cease to work in all ido modes, not just Smex.

Any ideas or info?

[ColemanGariety]

Possibly related to #60