diff --git a/meshmode/mesh/__init__.py b/meshmode/mesh/__init__.py
index f6ebe0cc6a3285fa4253c7bd0bf0cd4aafe2462c..3077143d09efe1c1a076ea2e191d46e8e52aeb66 100644
--- a/meshmode/mesh/__init__.py
+++ b/meshmode/mesh/__init__.py
@@ -828,7 +828,7 @@ def _compute_facial_adjacency_from_vertices(mesh):
             idx = fill_count.get((igrp, None), 0)
             fill_count[igrp, None] = idx + 1
 
-            fagrp = facial_adjacency_groups[igroup][inb_grp]
+            fagrp = facial_adjacency_groups[igroup][None]
             fagrp.elements[idx] = iel
             fagrp.element_faces[idx] = iface