diff --git a/src/kiri/mode/cam/op-outline.js b/src/kiri/mode/cam/op-outline.js
index 9daa9519..67558e4b 100644
--- a/src/kiri/mode/cam/op-outline.js
+++ b/src/kiri/mode/cam/op-outline.js
@@ -8,6 +8,7 @@ import { polygons as POLY } from '../../../geo/polygons.js';
 import { util as base_util } from '../../../geo/base.js';
 import { poly2polyEmit } from '../../../geo/paths.js';
 import { newPoint } from '../../../geo/point.js';
+import { addDogbones } from './slice.js';
 
 class OpOutline extends CamOp {
     constructor(state, op) {