diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index 6f87170..46b41c1 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -869,14 +869,20 @@ copy_heap_data(Oid OIDNewHeap, Oid OIDOldHeap, Oid OIDOldIndex,
 	/*
 	 * FreezeXid will become the table's new relfrozenxid, and that mustn't go
 	 * backwards, so take the max.
 	 */
 	if (TransactionIdPrecedes(FreezeXid, OldHeap->rd_rel->relfrozenxid))
 		FreezeXid = OldHeap->rd_rel->relfrozenxid;
 
+	/*
+	 * MultiXactCutoff, similarly, shouldn't go backwards either.
+	 */
+	if (MultiXactIdPrecedes(MultiXactCutoff, OldHeap->rd_rel->relminmxid))
+		MultiXactCutoff = OldHeap->rd_rel->relminmxid;
+
 	/* return selected values to caller */
 	*pFreezeXid = FreezeXid;
 	*pCutoffMulti = MultiXactCutoff;
 
 	/* Remember if it's a system catalog */
 	is_system_catalog = IsSystemRelation(OldHeap);