diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index bfe279cddf..f3d1779655 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -377,7 +377,7 @@ fill_seq_fork_with_data(Relation rel, HeapTuple tuple, ForkNumber forkNum)
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBufferExtended(rel, forkNum, P_NEW, RBM_NORMAL, NULL);
+	buf = ReadBufferExtended(rel, forkNum, P_NEW, RBM_ZERO_AND_LOCK, NULL);
 	Assert(BufferGetBlockNumber(buf) == 0);
 
 	page = BufferGetPage(buf);
@@ -388,8 +388,6 @@ fill_seq_fork_with_data(Relation rel, HeapTuple tuple, ForkNumber forkNum)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
-
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
 	 * have xmin = FrozenTransactionId now.  Otherwise it would become