diff --git a/src/ontology/components/cob-to-external.tsv b/src/ontology/components/cob-to-external.tsv
index f07bc80..15d359a 100644
--- a/src/ontology/components/cob-to-external.tsv
+++ b/src/ontology/components/cob-to-external.tsv
@@ -41,7 +41,7 @@ COB:0000007	subatomic particle	owl:equivalentClass	CHEBI:36342	subatomic particl
 COB:0000008	proton	owl:equivalentClass	CHEBI:24636	proton	.	HumanCurated
 COB:0000009	neutron	owl:equivalentClass	CHEBI:30222	neutron	.	HumanCurated
 COB:0000010	electron	owl:equivalentClass	CHEBI:10545	electron	.	HumanCurated
-COB:0000011	atom	skos:closeMatch	CHEBI:33250	atom	.	HumanCurated
+COB:0000011	atom	owl:equivalentClass	CHEBI:33250	atom	.	HumanCurated
 COB:0000012	atomic nucleus	owl:equivalentClass	CHEBI:33252	atomic nucleus	.	HumanCurated
 COB:0000013	molecular entity	skos:closeMatch	CHEBI:23367	molecular entity	No exact match in CHEBI	HumanCurated
 COB:0000013	molecular entity	skos:closeMatch	CHEBI:25367	molecule	This is electrically neutral in CHEBI but in COB it is generic. We should make it union of molecule and polyatomic ion	HumanCurated