diff --git a/src/kiri-mode/cam/prepare.js b/src/kiri-mode/cam/prepare.js
index b7ddfb2f..b081e318 100644
--- a/src/kiri-mode/cam/prepare.js
+++ b/src/kiri-mode/cam/prepare.js
@@ -273,7 +273,7 @@ function prepEach(widget, settings, print, firstPoint, update) {
         }
 
         // convert short planar moves to cuts in some cases
-        if (isMove && deltaXY <= moveLen) {
+        if (isMove && deltaXY <= moveLen && deltaZ <= 0) {
             let iscontour = tolerance > 0;
             let isflat = absDeltaZ < 0.001;
             // restrict this to contouring