diff --git a/pkg/cluster/sync_test.go b/pkg/cluster/sync_test.go
index 87e9dc8a5..9e2c026e9 100644
--- a/pkg/cluster/sync_test.go
+++ b/pkg/cluster/sync_test.go
@@ -801,6 +801,24 @@ func TestSyncStandbyClusterConfiguration(t *testing.T) {
 	// this should update the Patroni config again
 	err = cluster.syncStandbyClusterConfiguration()
 	assert.NoError(t, err)
+
+	// test with standby_host, standby_port and standby_primary_slot_name
+	cluster.Spec.StandbyCluster = &acidv1.StandbyDescription{
+		StandbyHost:            "remote-primary.example.com",
+		StandbyPort:            "5433",
+		StandbyPrimarySlotName: "standby_slot",
+	}
+	cluster.syncStatefulSet()
+	updatedSts4 := cluster.Statefulset
+
+	// check that pods have all three STANDBY_* environment variables
+	assert.Contains(t, updatedSts4.Spec.Template.Spec.Containers[0].Env, v1.EnvVar{Name: "STANDBY_HOST", Value: "remote-primary.example.com"})
+	assert.Contains(t, updatedSts4.Spec.Template.Spec.Containers[0].Env, v1.EnvVar{Name: "STANDBY_PORT", Value: "5433"})
+	assert.Contains(t, updatedSts4.Spec.Template.Spec.Containers[0].Env, v1.EnvVar{Name: "STANDBY_PRIMARY_SLOT_NAME", Value: "standby_slot"})
+
+	// this should update the Patroni config with host, port and primary_slot_name
+	err = cluster.syncStandbyClusterConfiguration()
+	assert.NoError(t, err)
 }
 
 func TestUpdateSecret(t *testing.T) {