diff --git a/src/hulls/skin.scad b/src/hulls/skin.scad
index af8d6d8..afe98d2 100644
--- a/src/hulls/skin.scad
+++ b/src/hulls/skin.scad
@@ -23,8 +23,8 @@ function skin_shape_slice(progress, thickness_difference, skew_this_slice, x_ske
     transform(
       rotation([tilt_this_slice,y_tilt_this_slice,0]),
         skin_key_shape([
-          total_key_width(0),
-          total_key_height(0),
+          total_key_width(0) - thickness_difference,
+          total_key_height(0) - thickness_difference,
           ],
           [$width_difference, $height_difference],
           progress,