diff --git a/sl2/slicer.pl b/sl2/slicer.pl
index 808fe4c..8be80a8 100755
--- a/sl2/slicer.pl
+++ b/sl2/slicer.pl
@@ -117,7 +117,7 @@ $height = $zmax - $zmin unless defined $height;
 
 # align with bottom (zmin == 0), z_pos = height - zoff
 
-$z_off = -$zmin - $height;
+$z_off = -$zmin;
 $z_pos = $height + $zmin;