diff --git a/data/db-schema/src/main/resources/net/corda/db/schema/vnode-vault/migration/ledger-utxo-creation-v5.1.xml b/data/db-schema/src/main/resources/net/corda/db/schema/vnode-vault/migration/ledger-utxo-creation-v5.1.xml
index 7dea5ca4eb..156636ce8d 100644
--- a/data/db-schema/src/main/resources/net/corda/db/schema/vnode-vault/migration/ledger-utxo-creation-v5.1.xml
+++ b/data/db-schema/src/main/resources/net/corda/db/schema/vnode-vault/migration/ledger-utxo-creation-v5.1.xml
@@ -148,7 +148,7 @@
         <!-- ^^ is this correct?? -->
         <sql dbms="postgresql">
             INSERT INTO utxo_transaction_metadata
-            SELECT
+            SELECT DISTINCT
                 hash,
                 data as canonical_data,
                 convert_from(data, 'UTF-8')::jsonb->'membershipGroupParametersHash' AS group_parameters_hash,