diff --git a/CHANGES.rst b/CHANGES.rst
index b1b7754..d8294fd 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -7,6 +7,7 @@ Unreleased
 ^^^^^^^^^^
 
 - **BREAKING CHANGE**: Dropped support for Python 3.8 and 3.9.
+- Reference unique constraint on transaction.native_transaction_id with the name of the column instead of the constraint name.
 
 
 0.18.0 (2026-04-15)
diff --git a/postgresql_audit/base.py b/postgresql_audit/base.py
index 528fda9..c9a2047 100644
--- a/postgresql_audit/base.py
+++ b/postgresql_audit/base.py
@@ -316,7 +316,7 @@ def set_activity_values(self, session):
                 insert(table)
                 .values(**values)
                 .on_conflict_do_nothing(
-                    constraint='transaction_unique_native_tx_id'
+                    index_elements=('native_transaction_id',)
                 )
             )
             session.execute(stmt)