diff --git a/src/maze/mz_hex_walls.scad b/src/maze/mz_hex_walls.scad
index d52a8316..ac8240ad 100644
--- a/src/maze/mz_hex_walls.scad
+++ b/src/maze/mz_hex_walls.scad
@@ -10,7 +10,7 @@
 
 use <_impl/_mz_hex_walls.scad>;
 
-function mz_hex_walls(cells, rows, columns, cell_radius, wall_thickness, left_border = true, bottom_border = true) = 
+function mz_hex_walls(cells, rows, columns, cell_radius, left_border = true, bottom_border = true) = 
     let(
         walls = [
              for(cell = cells)