diff --git a/translate2modelcif.py b/translate2modelcif.py
index bcfbed10a5cb5e257777e6b9c8767c11e1120f74..deb555130964f17ab3a31ac4f0645c6e663f4835 100644
--- a/translate2modelcif.py
+++ b/translate2modelcif.py
@@ -573,7 +573,6 @@ def _get_modelcif_entities(target_ents, source, asym_units, system):
         asym_units[cif_ent["pdb_chain_id"]] = modelcif.AsymUnit(
             mdlcif_ent,
             details="struct_asym.details",
-            strand_id=cif_ent["pdb_chain_id"],
         )
         system.target_entities.append(mdlcif_ent)