diff --git a/src/backend/access/nbtree/nbtxlog.c b/src/backend/access/nbtree/nbtxlog.c
index ac60db0..b894f8a 100644
--- a/src/backend/access/nbtree/nbtxlog.c
+++ b/src/backend/access/nbtree/nbtxlog.c
@@ -135,7 +135,7 @@ _bt_clear_incomplete_split(XLogReaderState *record, uint8 block_id)
 		Page		page = (Page) BufferGetPage(buf);
 		BTPageOpaque pageop = (BTPageOpaque) PageGetSpecialPointer(page);
 
-		Assert((pageop->btpo_flags & BTP_INCOMPLETE_SPLIT) != 0);
+		Assert(P_INCOMPLETE_SPLIT(pageop) != 0);
 		pageop->btpo_flags &= ~BTP_INCOMPLETE_SPLIT;
 
 		PageSetLSN(page, lsn);
@@ -598,7 +598,7 @@ btree_xlog_delete_get_latestRemovedXid(XLogReaderState *record)
 			UnlockReleaseBuffer(ibuffer);
 			return InvalidTransactionId;
 		}
-		LockBuffer(hbuffer, BUFFER_LOCK_SHARE);
+		LockBuffer(hbuffer, BT_READ);
 		hpage = (Page) BufferGetPage(hbuffer);
 
 		/*