diff --git a/src/parameterizations/lateral/MOM_hor_visc.F90 b/src/parameterizations/lateral/MOM_hor_visc.F90
index a5f354beba..1d6ff55ea9 100644
--- a/src/parameterizations/lateral/MOM_hor_visc.F90
+++ b/src/parameterizations/lateral/MOM_hor_visc.F90
@@ -911,7 +911,7 @@ subroutine horizontal_viscosity(u, v, h, uh, vh, diffu, diffv, MEKE, VarMix, G,
     endif
 
     ! Vorticity
-    if ((CS%Leith_Kh) .or. (CS%Leith_Ah) .or. (CS%use_Leithy) .or. (CS%id_vort_xy_q>0)) then
+    if ((CS%Leith_Kh) .or. (CS%Leith_Ah) .or. (CS%use_Leithy) .or. (CS%id_vort_xy_q>0) .or. CS%use_ZB2020) then
       if (CS%no_slip) then
         do J=js_vort,je_vort ; do I=is_vort,ie_vort
           vort_xy(I,J) = (2.0-G%mask2dBu(I,J)) * ( dvdx(I,J) - dudy(I,J) )