Fixed failing doctest on 64-bit Windows.
Fixed failing doctest on 64-bit Windows.

ManuSchmi88/landlab,Carralex/landlab,laijingtao/landlab,landlab/landlab,amandersillinois/landlab,amandersillinois/landlab,SiccarPoint/landlab,ManuSchmi88/landlab,csherwood-usgs/landlab,SiccarPoint/landlab,landlab/landlab,laijingtao/landlab,landlab/landlab,RondaStrauch/landlab,cmshobe/landlab,RondaStrauch/landlab,RondaStrauch/landlab,Carralex/landlab,Carralex/landlab,ManuSchmi88/landlab,cmshobe/landlab,csherwood-usgs/landlab,cmshobe/landlab