diff --git a/examples/maze/circle_maze.scad b/examples/maze/circle_maze.scad
index 5270e86d..f3f71e30 100644
--- a/examples/maze/circle_maze.scad
+++ b/examples/maze/circle_maze.scad
@@ -14,7 +14,7 @@ module circle_maze(start, r_blocks, block_width, wall_thickness, origin_offset)
     walls = mz_walls(blocks, double_r_blocks, double_r_blocks, block_width);
     
     half_width =  width / 2;
-    offset = is_undef(origin_offset) ? [half_width, half_width] : origin_offset;
+    offset = is_undef(origin_offset) ? [-half_width, -half_width] : origin_offset;
     
     for(wall = walls) {
         for(i = [0:len(wall) - 2]) {
diff --git a/src/experimental/ptf_circle.scad b/src/experimental/ptf_circle.scad
index 5a0e5a4a..a5469cfb 100644
--- a/src/experimental/ptf_circle.scad
+++ b/src/experimental/ptf_circle.scad
@@ -1,6 +1,6 @@
 function ptf_circle(point, offset) =
     let(
-        p = [point[0] - offset[1], point[1] - offset[0]],
+        p = [point[0] + offset[1], point[1] + offset[0]],
         n = max(abs(p[0]), abs(p[1])),
         r = n * 1.414,
         a = atan2(p[0], p[1])