diff --git a/src/mode/cam/ops.js b/src/mode/cam/ops.js
index 97ee90ec..c6e6565a 100644
--- a/src/mode/cam/ops.js
+++ b/src/mode/cam/ops.js
@@ -1029,7 +1029,6 @@
                             move(0, -y4);
                         });
                         poly.points.pop();
-                        poly.length--;
                         slice.camTrace = { tool: tool.getID(), rate: op.feed, plunge: op.rate };
                         slice.camLines = [ poly ];
                         slice.output()
diff --git a/src/mode/cam/slice.js b/src/mode/cam/slice.js
index 87aedeb7..8bf6175d 100644
--- a/src/mode/cam/slice.js
+++ b/src/mode/cam/slice.js
@@ -337,7 +337,6 @@
             for (let poly of noff) {
                 if (poly.open && poly.first().isMergable2D(poly.last())) {
                     poly.points.pop();
-                    poly.length--;
                     poly.open = false;
                 }
             }