diff --git a/examples/maze/regular_polygon_maze.scad b/examples/maze/regular_polygon_maze.scad
index 3289d2ec..cada4e2b 100644
--- a/examples/maze/regular_polygon_maze.scad
+++ b/examples/maze/regular_polygon_maze.scad
@@ -43,9 +43,9 @@ module regular_polygon_maze(radius, cblocks, levels, thickness = 1, sides) {
         starting_maze(cblocks, levels),
         cblocks, levels, y_circular = true
     );
-	
+
 	difference() {
-		 union() {
+		render() union() {
 			for(i = [1 : levels + 1]) {
 			    ring_regular_polygon(r * i, thickness, sides);
 			}
@@ -64,7 +64,7 @@ module regular_polygon_maze(radius, cblocks, levels, thickness = 1, sides) {
 			}
 	    }
 		
-		union() {
+		render() union() {
 		    // maze entry
 			// ring_regular_polygon_sector(r, arc_angle / 1.975 , thickness, r / 3, sides);