diff --git a/stitching/scan.py b/stitching/scan.py
index b13dff20e078a61c54d21bf7d3f7d6e2e8e0be99..6ef7c2cd820353556a3780ae89e4df6b3a793f33 100644
--- a/stitching/scan.py
+++ b/stitching/scan.py
@@ -122,7 +122,7 @@ def get_warped_masks_and_images(imgs, cameras, warp_scale, seam_aspect):
         corner, image_wp = warper.warp(imgs[idx], K, cameras[idx].R, cv.INTER_LINEAR, cv.BORDER_REFLECT)
         corners.append(corner)
         images_warped.append(image_wp)
-        p, mask_wp = warper.warp(masks[idx], K, cameras[idx].R, cv.INTER_LINEAR, cv.BORDER_REFLECT)
+        p, mask_wp = warper.warp(masks[idx], K, cameras[idx].R, cv.INTER_NEAREST, cv.BORDER_CONSTANT)
         masks_warped.append(mask_wp.get())
     return corners, images_warped, masks_warped