diff --git a/components/mpas-albany-landice/src/mode_forward/mpas_li_subglacial_hydro.F b/components/mpas-albany-landice/src/mode_forward/mpas_li_subglacial_hydro.F
index f73177ab3907..5a4049f146e3 100644
--- a/components/mpas-albany-landice/src/mode_forward/mpas_li_subglacial_hydro.F
+++ b/components/mpas-albany-landice/src/mode_forward/mpas_li_subglacial_hydro.F
@@ -1018,6 +1018,7 @@ subroutine calc_edge_quantities(block, err)
          endif
       end do
       where (waterFluxMask == 2)
+         diffusivity = 0.0_RKIND
          waterFluxAdvec = 0.0_RKIND
          waterFluxDiffu = 0.0_RKIND
          waterVelocity = 0.0_RKIND