diff --git a/src/backend/access/transam/xlogfuncs.c b/src/backend/access/transam/xlogfuncs.c
index 45a70668b1..e65502d51e 100644
--- a/src/backend/access/transam/xlogfuncs.c
+++ b/src/backend/access/transam/xlogfuncs.c
@@ -414,7 +414,7 @@ pg_walfile_name_offset(PG_FUNCTION_ARGS)
 	/*
 	 * xlogfilename
 	 */
-	XLByteToPrevSeg(locationpoint, xlogsegno, wal_segment_size);
+	XLByteToSeg(locationpoint, xlogsegno, wal_segment_size);
 	XLogFileName(xlogfilename, GetWALInsertionTimeLine(), xlogsegno,
 				 wal_segment_size);