diff --git a/hippunfold/workflow/scripts/gen_isosurface.py b/hippunfold/workflow/scripts/gen_isosurface.py
index 6e027553..185877e8 100644
--- a/hippunfold/workflow/scripts/gen_isosurface.py
+++ b/hippunfold/workflow/scripts/gen_isosurface.py
@@ -230,7 +230,7 @@ def compute_geodesic_distances(vertices, faces, source_indices):
 
 
 # apply largest connected component
-points, faces, i_concomp = largest_connected_component(vertices_orig, faces)
+points, faces, i_concomp = largest_connected_component(points, faces)
 
 
 # write to gifti