diff --git a/src/backend/storage/ipc/procarray.c b/src/backend/storage/ipc/procarray.c
index 166c3cf2f88..1bb87360463 100644
--- a/src/backend/storage/ipc/procarray.c
+++ b/src/backend/storage/ipc/procarray.c
@@ -3247,7 +3247,8 @@ RecordKnownAssignedTransactionIds(TransactionId xid)
 		next_expected_xid = latestObservedXid;
 		TransactionIdAdvance(next_expected_xid);
 		LWLockAcquire(XidGenLock, LW_EXCLUSIVE);
-		ShmemVariableCache->nextXid = next_expected_xid;
+		if (TransactionIdFollows(next_expected_xid, ShmemVariableCache->nextXid))
+			ShmemVariableCache->nextXid = next_expected_xid;
 		LWLockRelease(XidGenLock);
 	}
 }