diff --git a/a/AX.cif b/a/AX.cif
index 794c4cb84..961696cf7 100644
--- a/a/AX.cif
+++ b/a/AX.cif
@@ -19,4 +19,4 @@ _chem_comp_atom.partial_charge
 _chem_comp_atom.x
 _chem_comp_atom.y
 _chem_comp_atom.z
-AX AX O O 0.000 0.000 0.000 0.000
+AX AX O DUM 0.000 0.000 0.000 0.000