diff --git a/src/kiri-mode/cam/ops.js b/src/kiri-mode/cam/ops.js
index 1b886f32..56448fea 100644
--- a/src/kiri-mode/cam/ops.js
+++ b/src/kiri-mode/cam/ops.js
@@ -546,7 +546,7 @@ class OpOutline extends CamOp {
         if (op.top) {
             let first = slices[0];
             let zlist = slices.map(s => s.z);
-            for (let z of indices.filter(v => v >= zMax).reverse()) {
+            for (let z of indices.filter(v => v >= zMax)) {
                 if (zlist.contains(z)) {
                     continue;
                 }