diff --git a/src/parameterizations/vertical/MOM_set_diffusivity.F90 b/src/parameterizations/vertical/MOM_set_diffusivity.F90
index 0cb39b2f15..d3ced12160 100644
--- a/src/parameterizations/vertical/MOM_set_diffusivity.F90
+++ b/src/parameterizations/vertical/MOM_set_diffusivity.F90
@@ -694,6 +694,8 @@ subroutine set_diffusivity(u, v, h, u_h, v_h, tv, fluxes, optics, visc, dt, &
   if (associated(dd%KS_extra)) deallocate(dd%KS_extra)
   if (associated(dd%drho_rat)) deallocate(dd%drho_rat)
   if (associated(dd%Kd_BBL)) deallocate(dd%Kd_BBL)
+  if (associated(dd%Kd_bkgnd)) deallocate(dd%Kd_bkgnd)
+  if (associated(dd%Kv_bkgnd)) deallocate(dd%Kv_bkgnd)
 
   if (showCallTree) call callTree_leave("set_diffusivity()")