diff --git a/MOM6/CMakeLists.txt b/MOM6/CMakeLists.txt
index 5a87d00..b041e45 100644
--- a/MOM6/CMakeLists.txt
+++ b/MOM6/CMakeLists.txt
@@ -229,7 +229,7 @@ target_sources(OM3_mom6 PRIVATE
   MOM6/src/parameterizations/vertical/MOM_full_convection.F90
   MOM6/src/parameterizations/vertical/MOM_geothermal.F90
   MOM6/src/parameterizations/vertical/MOM_internal_tide_input.F90
-  MOM6/src/parameterizations/vertical/MOM_kappa_shear.F90
+ # MOM6/src/parameterizations/vertical/MOM_kappa_shear.F90
   MOM6/src/parameterizations/vertical/MOM_opacity.F90
   MOM6/src/parameterizations/vertical/MOM_regularize_layers.F90
   MOM6/src/parameterizations/vertical/MOM_set_diffusivity.F90
@@ -381,6 +381,7 @@ add_patched_source(OM3_mom6 MOM6/src/tracer/MOM_generic_tracer.F90)
 add_patched_source(OM3_mom6 MOM6/src/core/MOM_forcing_type.F90)
 add_patched_source(OM3_mom6 MOM6/config_src/infra/FMS2/MOM_io_infra.F90)
 add_patched_source(OM3_mom6 MOM6/src/diagnostics/MOM_PointAccel.F90)
+add_patched_source(OM3_mom6 MOM6/src/parameterizations/vertical/MOM_kappa_shear.F90)
 ### Install and Export
 
 ## Library
diff --git a/MOM6/patches/MOM_kappa_shear.F90.patch b/MOM6/patches/MOM_kappa_shear.F90.patch
new file mode 100644
index 0000000..525b74d
--- /dev/null
+++ b/MOM6/patches/MOM_kappa_shear.F90.patch
@@ -0,0 +1,46 @@
+diff --git a/src/parameterizations/vertical/MOM_kappa_shear.F90 b/src/parameterizations/vertical/MOM_kappa_shear.F90.new
+index f2c47ab21..ce10c84cf 100644
+--- a/src/parameterizations/vertical/MOM_kappa_shear.F90
++++ b/src/parameterizations/vertical/MOM_kappa_shear.F90
+@@ -97,6 +97,8 @@ type, public :: Kappa_shear_CS ; private
+                              !! time average TKE when there is mass in all layers.  Otherwise always
+                              !! report the time-averaged TKE, as is currently done when there
+                              !! are some massless layers.
++  logical :: VS_viscosity_bug !< If true, use a bug in the calculation of the viscosity that sets
++                             !! it to zero for all vertices that are on a coastline.
+   logical :: restrictive_tolerance_check !< If false, uses the less restrictive tolerance check to
+                              !! determine if a timestep is acceptable for the KS_it outer iteration
+                              !! loop, as the code was originally written.  True uses the more
+@@ -607,10 +609,17 @@ subroutine Calc_kappa_shear_vertex(u_in, v_in, h, T_in, S_in, tv, p_surf, kappa_
+       enddo
+     endif ; enddo ! i-loop
+ 
+-    do K=1,nz+1 ; do I=IsB,IeB
+-      tke_io(I,J,K) = G%mask2dBu(I,J) * tke_2d(I,K)
+-      kv_io(I,J,K) = ( G%mask2dBu(I,J) * kappa_2d(I,K,J2) ) * CS%Prandtl_turb
+-    enddo ; enddo
++    if (CS%VS_viscosity_bug) then
++      do K=1,nz+1 ; do I=IsB,IeB
++        tke_io(I,J,K) = G%mask2dBu(I,J) * tke_2d(I,K)
++        kv_io(I,J,K) = ( G%mask2dBu(I,J) * kappa_2d(I,K,J2) ) * CS%Prandtl_turb
++      enddo; enddo
++    else
++      do K=1,nz+1 ; do I=IsB,IeB
++        tke_io(I,J,K) = tke_2d(I,K)
++        kv_io(I,J,K) = kappa_2d(I,K,J2) * CS%Prandtl_turb
++      enddo; enddo
++    endif
+     if (J>=G%jsc) then ; do K=1,nz+1 ; do i=G%isc,G%iec
+       ! Set the diffusivities in tracer columns from the values at vertices.
+       kappa_io(i,j,K) = G%mask2dT(i,j) * 0.25 * &
+@@ -1873,6 +1882,10 @@ function kappa_shear_init(Time, G, GV, US, param_file, diag, CS)
+                  "If true, do the calculations of the shear-driven mixing "//&
+                  "at the cell vertices (i.e., the vorticity points).", &
+                  default=.false., do_not_log=just_read)
++  call get_param(param_file, mdl, "VERTEX_SHEAR_VISCOSITY_BUG", CS%VS_viscosity_bug, &
++                 "If true, use a bug in vertex shear that zeros out viscosities at "//&
++                 "vertices on coastlines.", &
++                 default=.true., do_not_log=just_read.or.(.not.CS%KS_at_vertex))
+   call get_param(param_file, mdl, "RINO_CRIT", CS%RiNo_crit, &
+                  "The critical Richardson number for shear mixing.", &
+                  units="nondim", default=0.25, do_not_log=just_read)