diff --git a/actions/ost-compare-ligand-structures b/actions/ost-compare-ligand-structures
index af49ef3463ea046f10b91d0700d02171f0dc828f..176cd5e1f6028c096d9b1bdc3dbd4b6f3fdce673 100644
--- a/actions/ost-compare-ligand-structures
+++ b/actions/ost-compare-ligand-structures
@@ -57,7 +57,6 @@ import os
 import traceback
 
 import ost
-from ost import conop
 from ost import io
 from ost.mol.alg import ligand_scoring