diff --git a/shelf_with_drawers.scad b/shelf_with_drawers.scad
index cca7ece..7d683b7 100644
--- a/shelf_with_drawers.scad
+++ b/shelf_with_drawers.scad
@@ -30,6 +30,11 @@ lath_depth = 4.8; /* y */
 
 board_height = 1.6; /* z */
 
+post_height = drawers_begin + (drawer_size * drawers_number)
+              + (board_height * drawers_number + board_height);
+
+echo("Post height is", post_height);
+
 module drawer()
 {
     /* Sides */
@@ -92,8 +97,6 @@ module lath(length)
 
 module shelf()
 {
-    function post_height() = drawers_begin + (drawer_size * drawers_number)
-                             + (board_height * drawers_number + board_height);
     /* Posts */
     color("olive")
     {
@@ -103,7 +106,7 @@ module shelf()
             {
                 translate([x, y, 0])
                 {
-                    lath(post_height());
+                    lath(post_height);
                 }
             }
         }
@@ -128,7 +131,7 @@ module shelf()
 
             /* Top */
             translate(
-                [x, drawer_size - lath_depth, post_height() - lath_depth - 10])
+                [x, drawer_size - lath_depth, post_height - lath_depth - 10])
             {
                 rotate([90, 0, 0])
                 {