diff --git a/tests/integration/test_charm.py b/tests/integration/test_charm.py
index f9a3af31f3..2d8f378e82 100644
--- a/tests/integration/test_charm.py
+++ b/tests/integration/test_charm.py
@@ -186,10 +186,10 @@ async def test_postgresql_locales(ops_test: OpsTest) -> None:
 async def test_postgresql_parameters_change(ops_test: OpsTest) -> None:
     """Test that's possible to change PostgreSQL parameters."""
     await ops_test.model.applications[DATABASE_APP_NAME].set_config({
-        "memory_max_prepared_transactions": "100",
-        "memory_shared_buffers": "32768",  # 2 * 128MB. Patroni may refuse the config if < 128MB
-        "response_lc_monetary": "en_GB.utf8",
-        "experimental_max_connections": "200",
+        "memory-max-prepared-transactions": "100",
+        "memory-shared-buffers": "32768",  # 2 * 128MB. Patroni may refuse the config if < 128MB
+        "response-lc-monetary": "en_GB.utf8",
+        "experimental-max-connections": "200",
     })
     await ops_test.model.wait_for_idle(apps=[DATABASE_APP_NAME], status="active", idle_period=30)
     password = await get_password(ops_test)