diff --git a/anglerfish/demux/adaptor.py b/anglerfish/demux/adaptor.py
index e662d5b..45d0780 100644
--- a/anglerfish/demux/adaptor.py
+++ b/anglerfish/demux/adaptor.py
@@ -23,7 +23,6 @@ def __init__(
         i5_index: str | None = None,
     ):
         self.name: str = name
-        self.index_token: str = INDEX_TOKEN
         self.i5 = AdaptorPart(
             sequence_token=adaptors[name]["i5"], name=name, end="i5", index_seq=i5_index
         )