diff --git a/pkg/ccl/streamingccl/replicationtestutils/testutils.go b/pkg/ccl/streamingccl/replicationtestutils/testutils.go
index 00519b1b2821..ffce2d84e1f1 100644
--- a/pkg/ccl/streamingccl/replicationtestutils/testutils.go
+++ b/pkg/ccl/streamingccl/replicationtestutils/testutils.go
@@ -478,6 +478,7 @@ var defaultSrcClusterSetting = map[string]string{
 	`kv.closed_timestamp.target_duration`:            `'100ms'`,
 	`kv.rangefeed.closed_timestamp_refresh_interval`: `'200ms'`,
 	`kv.closed_timestamp.side_transport_interval`:    `'50ms'`,
+	`changefeed.mux_rangefeed.enabled`:               `false`,
 	// Large timeout makes test to not fail with unexpected timeout failures.
 	`stream_replication.job_liveness.timeout`:            `'3m'`,
 	`stream_replication.stream_liveness_track_frequency`: `'2s'`,