diff --git a/sf_sfclayrev.F90 b/sf_sfclayrev.F90
index d05ff3e..2d075c6 100644
--- a/sf_sfclayrev.F90
+++ b/sf_sfclayrev.F90
@@ -378,6 +378,8 @@ subroutine sf_sfclayrev_run(ux,vx,t1d,qv1d,p1d,dz8w1d,                &
 
  do 320 i = its,ite
 !                                                                           
+    zol(i) = 0.
+!
     if(br(i).gt.0) then
        if(br(i).gt.250.0) then
           zol(i)=zolri(250.0,za(i),znt(i))