diff --git a/anglerfish/anglerfish.py b/anglerfish/anglerfish.py
index da881a5..b346f6e 100755
--- a/anglerfish/anglerfish.py
+++ b/anglerfish/anglerfish.py
@@ -277,7 +277,7 @@ def run_demux(args):
             sample_dists = [
                 (
                     lev.distance(
-                        i[0], f"{x.adaptor.i7_index}+{x.adaptor.i5_index}".lower()
+                        i[0], f"{x.adaptor.i7.index_seq}+{x.adaptor.i5.index_seq}".lower()
                     ),
                     x.sample_name,
                 )