diff --git a/src/backend/utils/time/snapmgr.c b/src/backend/utils/time/snapmgr.c
index 85b5d5cdb9e..dc13b231de5 100644
--- a/src/backend/utils/time/snapmgr.c
+++ b/src/backend/utils/time/snapmgr.c
@@ -1045,7 +1045,7 @@ SnapshotResetXmin(void)
 
 	if (pairingheap_is_empty(&RegisteredSnapshots))
 	{
-		MyPgXact->xmin = InvalidTransactionId;
+		MyPgXact->xmin = TransactionXmin = InvalidTransactionId;
 		return;
 	}
 
@@ -1053,7 +1053,7 @@ SnapshotResetXmin(void)
 										pairingheap_first(&RegisteredSnapshots));
 
 	if (TransactionIdPrecedes(MyPgXact->xmin, minSnapshot->xmin))
-		MyPgXact->xmin = minSnapshot->xmin;
+		MyPgXact->xmin = TransactionXmin = minSnapshot->xmin;
 }
 
 /*