diff --git a/src/ccpp_constituent_prop_mod.F90 b/src/ccpp_constituent_prop_mod.F90
index 6bdc2e6f..a81f4cac 100644
--- a/src/ccpp_constituent_prop_mod.F90
+++ b/src/ccpp_constituent_prop_mod.F90
@@ -229,6 +229,7 @@ subroutine copyConstituent(outConst, inConst)
       outConst%thermo_active       = inConst%thermo_active
       outConst%water_species       = inConst%water_species
       outConst%var_units           = inConst%var_units
+      outConst%const_water         = inConst%const_water
    end subroutine copyConstituent
 
    !#######################################################################