diff --git a/platformtest/tests/replication.go b/platformtest/tests/replication.go
index c893e79..972e8a4 100644
--- a/platformtest/tests/replication.go
+++ b/platformtest/tests/replication.go
@@ -94,6 +94,7 @@ func (i replicationInvocation) Do(ctx *platformtest.Context) *report.Report {
 		ReplicationConfig: &pdu.ReplicationConfig{
 			Protection: i.guarantee,
 		},
+		SizeEstimationConcurrency: 1,
 	}
 
 	report, wait := replication.Do(