debhelper backport is broken due to dependencies not backported

From the backports repo:

apt-get install debhelper

Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
debhelper : Depends: dh-autoreconf (>= 17~) but 12~ubuntu16.04.1 is to be installed
Depends: dh-strip-nondeterminism (>= 0.028~) but 0.015-1 is to be installed
E: Unable to correct problems, you have held broken packages.

This breaks apt-get build-dep for most everything.