diff --git a/examples/sierpinski_pyramid.scad b/examples/sierpinski_pyramid.scad
index 002ab16d..24aa84da 100644
--- a/examples/sierpinski_pyramid.scad
+++ b/examples/sierpinski_pyramid.scad
@@ -9,25 +9,25 @@ sierpinski_pyramid(side_leng, min_leng, thickness, $fn = 4);
 module sierpinski_pyramid(side_leng, min_leng, thickness) {
     pyramid_frame(side_leng, thickness);    
     if(side_leng > min_leng){
-        half_len = side_leng / 2;
-        h = half_len * 0.707107;
+        half_leng = side_leng / 2;
+        h = half_leng * 0.707107;
         pt = [side_leng / 4, side_leng / 4, 0];
         for(i=[0:3]) {
             rotate([0, 0, i * 90])
             translate(pt)
-                sierpinski_pyramid(half_len, min_leng, thickness);
+                sierpinski_pyramid(half_leng, min_leng, thickness);
         }
         translate([0, 0, h]) 
-            sierpinski_pyramid(half_len, min_leng, thickness);
+            sierpinski_pyramid(half_leng, min_leng, thickness);
     }
 }
 
 module pyramid_frame(side_leng, thickness) {
-    half_len = side_leng / 2;
-    h = half_len * 1.414214;
+    half_leng = side_leng / 2;
+    h = half_leng * 1.414214;
     
-    tri_pts = [[0, 0, h], [half_len, half_len, 0], [half_len, -half_len, 0], [0, 0, h]];
-    line_pts = [[half_len, half_len, 0], [-half_len, half_len, 0]];
+    tri_pts = [[0, 0, h], [half_leng, half_leng, 0], [half_leng, -half_leng, 0], [0, 0, h]];
+    line_pts = [[half_leng, half_leng, 0], [-half_leng, half_leng, 0]];
     
     hull_polyline3d(tri_pts, thickness);
     mirror([1, 0, 0])