diff --git a/Makefile b/Makefile
index 5da6dc3e..267b3edf 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,6 @@ OBJS = backup.o \
 	status.o \
 	util.o \
 	validate.o \
-	xlog.o \
 	datapagemap.o \
 	parsexlog.o \
 	xlogreader.o \
diff --git a/pg_arman.h b/pg_arman.h
index 17ab01f1..0a6044ea 100644
--- a/pg_arman.h
+++ b/pg_arman.h
@@ -276,9 +276,6 @@ extern int pgFileComparePathDesc(const void *f1, const void *f2);
 extern int pgFileCompareMtime(const void *f1, const void *f2);
 extern int pgFileCompareMtimeDesc(const void *f1, const void *f2);
 
-/* in xlog.c */
-extern bool xlog_is_complete_wal(const pgFile *file);
-
 /* in data.c */
 extern bool backup_data_file(const char *from_root, const char *to_root,
 							 pgFile *file, const XLogRecPtr *lsn);
diff --git a/xlog.c b/xlog.c
deleted file mode 100644
index aed89238..00000000
--- a/xlog.c
+++ /dev/null
@@ -1,67 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * xlog.c: Parse WAL files.
- *
- * Copyright (c) 2009-2013, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
- *
- *-------------------------------------------------------------------------
- */
-
-#include "pg_arman.h"
-
-#include <stdio.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#include "access/xlog_internal.h"
-
-/*
- * XLogLongPageHeaderData is modified in 8.3, but the layout is compatible
- * except xlp_xlog_blcksz.
- */
-typedef union XLogPage
-{
-	XLogPageHeaderData		header;
-	XLogLongPageHeaderData	lheader;
-	char					data[XLOG_BLCKSZ];
-} XLogPage;
-
-/*
- * Return whether the file is a WAL segment or not.
- * based on ValidXLOGHeader() in src/backend/access/transam/xlog.c.
- */
-bool
-xlog_is_complete_wal(const pgFile *file)
-{
-	FILE		   *fp;
-	XLogPage		page;
-
-	fp = fopen(file->path, "r");
-	if (!fp)
-		return false;
-	if (fread(&page, 1, sizeof(page), fp) != XLOG_BLCKSZ)
-	{
-		fclose(fp);
-		return false;
-	}
-	fclose(fp);
-
-	/* check header */
-	if (page.header.xlp_magic != XLOG_PAGE_MAGIC)
-		return false;
-	if ((page.header.xlp_info & ~XLP_ALL_FLAGS) != 0)
-		return false;
-	if ((page.header.xlp_info & XLP_LONG_HEADER) == 0)
-		return false;
-	if (page.lheader.xlp_seg_size != XLogSegSize)
-		return false;
-	if (page.lheader.xlp_xlog_blcksz != XLOG_BLCKSZ)
-		return false;
-
-	/* check size (the actual file size, not backup file size) */
-	if (file->size != XLogSegSize)
-		return false;
-
-	return true;
-}