diff --git a/configure.ac b/configure.ac
index efab8d8412b6..123ddbbaf3eb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -187,8 +187,6 @@ AC_CHECK_FUNCS_ONCE([
 	getmntent
 	getuid
 	keyctl
-	llseek
-	lseek64
 	memset
 	setmntent
 	clock_gettime
diff --git a/fsck/Makefile.am b/fsck/Makefile.am
index 579dd26cd6c9..40d31b837dac 100644
--- a/fsck/Makefile.am
+++ b/fsck/Makefile.am
@@ -1,7 +1,7 @@
 ## Makefile.am
 
 AM_CPPFLAGS = ${libuuid_CFLAGS} -I$(top_srcdir)/include
-AM_CFLAGS = -Wall
+AM_CFLAGS = -Wall -D_FILE_OFFSET_BITS=64
 sbin_PROGRAMS = fsck.f2fs
 noinst_HEADERS = common.h dict.h dqblk_v2.h f2fs.h fsck.h node.h quotaio.h \
 		quotaio_tree.h quotaio_v2.h xattr.h compress.h
diff --git a/include/android_config.h b/include/android_config.h
index 141fe0640a17..da8abcb2f972 100644
--- a/include/android_config.h
+++ b/include/android_config.h
@@ -30,8 +30,6 @@
 #define HAVE_FSTAT 1
 #define HAVE_FSTAT64 1
 #define HAVE_GETMNTENT 1
-#define HAVE_LLSEEK 1
-#define HAVE_LSEEK64 1
 #define HAVE_MEMSET 1
 #define HAVE_SELINUX_ANDROID_H 1
 #define HAVE_SETMNTENT 1
@@ -67,7 +65,6 @@
 #define HAVE_FSTAT 1
 #define HAVE_FSTAT64 1
 #define HAVE_GETMNTENT 1
-#define HAVE_LLSEEK 1
 #define HAVE_MEMSET 1
 #define HAVE_SPARSE_SPARSE_H 1
 #define HAVE_LIBLZ4 1
@@ -78,6 +75,5 @@
 #endif
 
 #if defined(_WIN32)
-#define HAVE_LSEEK64
 #define HAVE_SPARSE_SPARSE_H 1
 #endif
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 871d773176e9..69d46f833c30 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -3,7 +3,7 @@
 lib_LTLIBRARIES = libf2fs.la
 
 libf2fs_la_SOURCES = libf2fs.c libf2fs_io.c libf2fs_zoned.c nls_utf8.c
-libf2fs_la_CFLAGS = -Wall
+libf2fs_la_CFLAGS = -Wall -D_FILE_OFFSET_BITS=64
 libf2fs_la_CPPFLAGS = -I$(top_srcdir)/include
 libf2fs_la_LDFLAGS = -version-info $(LIBF2FS_CURRENT):$(LIBF2FS_REVISION):$(LIBF2FS_AGE)
 
diff --git a/lib/libf2fs.c b/lib/libf2fs.c
index 577a7e8caccd..c3d574432c87 100644
--- a/lib/libf2fs.c
+++ b/lib/libf2fs.c
@@ -6,9 +6,6 @@
  *
  * Dual licensed under the GPL or LGPL version 2 licenses.
  */
-#define _LARGEFILE64_SOURCE
-#define _FILE_OFFSET_BITS 64
-
 #include <f2fs_fs.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/lib/libf2fs_io.c b/lib/libf2fs_io.c
index 1a8167dc60e5..74e5f3ac49ba 100644
--- a/lib/libf2fs_io.c
+++ b/lib/libf2fs_io.c
@@ -11,8 +11,6 @@
  *
  * Dual licensed under the GPL or LGPL version 2 licenses.
  */
-#define _LARGEFILE64_SOURCE
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -67,22 +65,13 @@ static int __get_device_fd(__u64 *offset)
 	return -1;
 }
 
-#ifndef HAVE_LSEEK64
-typedef off_t	off64_t;
-
-static inline off64_t lseek64(int fd, __u64 offset, int set)
-{
-	return lseek(fd, offset, set);
-}
-#endif
-
 /* ---------- dev_cache, Least Used First (LUF) policy  ------------------- */
 /*
  * Least used block will be the first victim to be replaced when max hash
  * collision exceeds
  */
 static bool *dcache_valid; /* is the cached block valid? */
-static off64_t  *dcache_blk; /* which block it cached */
+static off_t  *dcache_blk; /* which block it cached */
 static uint64_t *dcache_lastused; /* last used ticks for cache entries */
 static char *dcache_buf; /* cached block data */
 static uint64_t dcache_usetick; /* current use tick */
@@ -172,7 +161,7 @@ static int dcache_alloc_all(long n)
 {
 	if (n <= 0)
 		return -1;
-	if ((dcache_blk = (off64_t *) malloc(sizeof(off64_t) * n)) == NULL
+	if ((dcache_blk = (off_t *) malloc(sizeof(off_t) * n)) == NULL
 		|| (dcache_lastused = (uint64_t *)
 				malloc(sizeof(uint64_t) * n)) == NULL
 		|| (dcache_buf = (char *) malloc (F2FS_BLKSIZE * n)) == NULL
@@ -257,7 +246,7 @@ static inline long dcache_relocate(long entry, int n)
 			dcache_config.num_cache_entry;
 }
 
-static long dcache_find(off64_t blk)
+static long dcache_find(off_t blk)
 {
 	register long n = dcache_config.num_cache_entry;
 	register unsigned m = dcache_config.max_hash_collision;
@@ -278,10 +267,10 @@ static long dcache_find(off64_t blk)
 }
 
 /* Physical read into cache */
-static int dcache_io_read(int fd, long entry, off64_t offset, off64_t blk)
+static int dcache_io_read(int fd, long entry, off_t offset, off_t blk)
 {
-	if (lseek64(fd, offset, SEEK_SET) < 0) {
-		MSG(0, "\n lseek64 fail.\n");
+	if (lseek(fd, offset, SEEK_SET) < 0) {
+		MSG(0, "\n lseek fail.\n");
 		return -1;
 	}
 	if (read(fd, dcache_buf + entry * F2FS_BLKSIZE, F2FS_BLKSIZE) < 0) {
@@ -308,12 +297,12 @@ static int dcache_io_read(int fd, long entry, off64_t offset, off64_t blk)
  *       1: cache not available (uninitialized)
  *      -1: error
  */
-static int dcache_update_rw(int fd, void *buf, off64_t offset,
+static int dcache_update_rw(int fd, void *buf, off_t offset,
 		size_t byte_count, bool is_write)
 {
-	off64_t blk;
+	off_t blk;
 	int addr_in_blk;
-	off64_t start;
+	off_t start;
 
 	if (!dcache_initialized)
 		dcache_init(); /* auto initialize */
@@ -377,13 +366,13 @@ static int dcache_update_rw(int fd, void *buf, off64_t offset,
  * return value: 1: cache not available
  *               0: success, -1: I/O error
  */
-int dcache_update_cache(int fd, void *buf, off64_t offset, size_t count)
+int dcache_update_cache(int fd, void *buf, off_t offset, size_t count)
 {
 	return dcache_update_rw(fd, buf, offset, count, true);
 }
 
 /* handles read into cache + read into buffer  */
-int dcache_read(int fd, void *buf, off64_t offset, size_t count)
+int dcache_read(int fd, void *buf, off_t offset, size_t count)
 {
 	return dcache_update_rw(fd, buf, offset, count, false);
 }
@@ -395,7 +384,7 @@ int dev_read_version(void *buf, __u64 offset, size_t len)
 {
 	if (c.sparse_mode)
 		return 0;
-	if (lseek64(c.kd, (off64_t)offset, SEEK_SET) < 0)
+	if (lseek(c.kd, (off_t)offset, SEEK_SET) < 0)
 		return -1;
 	if (read(c.kd, buf, len) < 0)
 		return -1;
@@ -534,10 +523,10 @@ int dev_read(void *buf, __u64 offset, size_t len)
 
 	/* err = 1: cache not available, fall back to non-cache R/W */
 	/* err = 0: success, err=-1: I/O error */
-	err = dcache_read(fd, buf, (off64_t)offset, len);
+	err = dcache_read(fd, buf, (off_t)offset, len);
 	if (err <= 0)
 		return err;
-	if (lseek64(fd, (off64_t)offset, SEEK_SET) < 0)
+	if (lseek(fd, (off_t)offset, SEEK_SET) < 0)
 		return -1;
 	if (read(fd, buf, len) < 0)
 		return -1;
@@ -580,9 +569,9 @@ int dev_write(void *buf, __u64 offset, size_t len)
 	 * dcache_update_cache() just update cache, won't do I/O.
 	 * Thus even no error, we need normal non-cache I/O for actual write
 	 */
-	if (dcache_update_cache(fd, buf, (off64_t)offset, len) < 0)
+	if (dcache_update_cache(fd, buf, (off_t)offset, len) < 0)
 		return -1;
-	if (lseek64(fd, (off64_t)offset, SEEK_SET) < 0)
+	if (lseek(fd, (off_t)offset, SEEK_SET) < 0)
 		return -1;
 	if (write(fd, buf, len) < 0)
 		return -1;
@@ -596,7 +585,7 @@ int dev_write_block(void *buf, __u64 blk_addr)
 
 int dev_write_dump(void *buf, __u64 offset, size_t len)
 {
-	if (lseek64(c.dump_fd, (off64_t)offset, SEEK_SET) < 0)
+	if (lseek(c.dump_fd, (off_t)offset, SEEK_SET) < 0)
 		return -1;
 	if (write(c.dump_fd, buf, len) < 0)
 		return -1;
@@ -618,7 +607,7 @@ int dev_fill(void *buf, __u64 offset, size_t len)
 	/* Only allow fill to zero */
 	if (*((__u8*)buf))
 		return -1;
-	if (lseek64(fd, (off64_t)offset, SEEK_SET) < 0)
+	if (lseek(fd, (off_t)offset, SEEK_SET) < 0)
 		return -1;
 	if (write(fd, buf, len) < 0)
 		return -1;
diff --git a/lib/libf2fs_zoned.c b/lib/libf2fs_zoned.c
index a0dd8bd269ef..2ab2497ab211 100644
--- a/lib/libf2fs_zoned.c
+++ b/lib/libf2fs_zoned.c
@@ -6,7 +6,6 @@
  *
  * Dual licensed under the GPL or LGPL version 2 licenses.
  */
-#define _LARGEFILE64_SOURCE
 
 #include <f2fs_fs.h>
 #include <stdio.h>
diff --git a/mkfs/Makefile.am b/mkfs/Makefile.am
index af5b1c74b831..bfffd88de108 100644
--- a/mkfs/Makefile.am
+++ b/mkfs/Makefile.am
@@ -1,7 +1,7 @@
 ## Makefile.am
 
 AM_CPPFLAGS = ${libuuid_CFLAGS} ${libblkid_CFLAGS} -I$(top_srcdir)/include
-AM_CFLAGS = -Wall -DWITH_BLKDISCARD
+AM_CFLAGS = -Wall -DWITH_BLKDISCARD -D_FILE_OFFSET_BITS=64
 sbin_PROGRAMS = mkfs.f2fs
 noinst_HEADERS = f2fs_format_utils.h
 include_HEADERS = $(top_srcdir)/include/f2fs_fs.h
@@ -10,7 +10,7 @@ mkfs_f2fs_LDADD = ${libuuid_LIBS} ${libblkid_LIBS} $(top_builddir)/lib/libf2fs.l
 
 lib_LTLIBRARIES = libf2fs_format.la
 libf2fs_format_la_SOURCES = f2fs_format_main.c f2fs_format.c f2fs_format_utils.c
-libf2fs_format_la_CFLAGS = -DWITH_BLKDISCARD
+libf2fs_format_la_CFLAGS = -DWITH_BLKDISCARD -D_FILE_OFFSET_BITS=64
 libf2fs_format_la_LDFLAGS = ${libblkid_LIBS} ${libuuid_LIBS} -L$(top_builddir)/lib -lf2fs \
 	-version-info $(FMT_CURRENT):$(FMT_REVISION):$(FMT_AGE)
 
diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
index 019fb3a3d9af..d937eda39221 100644
--- a/mkfs/f2fs_format.c
+++ b/mkfs/f2fs_format.c
@@ -6,8 +6,6 @@
  *
  * Dual licensed under the GPL or LGPL version 2 licenses.
  */
-#define _LARGEFILE64_SOURCE
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <fcntl.h>
diff --git a/mkfs/f2fs_format_main.c b/mkfs/f2fs_format_main.c
index d8c9cea160a3..08c1b254d24c 100644
--- a/mkfs/f2fs_format_main.c
+++ b/mkfs/f2fs_format_main.c
@@ -6,8 +6,6 @@
  *
  * Dual licensed under the GPL or LGPL version 2 licenses.
  */
-#define _LARGEFILE64_SOURCE
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <fcntl.h>
diff --git a/mkfs/f2fs_format_utils.c b/mkfs/f2fs_format_utils.c
index 448fbaa8866e..437f113b49c6 100644
--- a/mkfs/f2fs_format_utils.c
+++ b/mkfs/f2fs_format_utils.c
@@ -6,20 +6,10 @@
  *
  * Dual licensed under the GPL or LGPL version 2 licenses.
  */
-#ifndef _LARGEFILE_SOURCE
-#define _LARGEFILE_SOURCE
-#endif
-#ifndef _LARGEFILE64_SOURCE
-#define _LARGEFILE64_SOURCE
-#endif
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
 
-#ifndef _FILE_OFFSET_BITS
-#define _FILE_OFFSET_BITS 64
-#endif
-
 #include <f2fs_fs.h>
 
 #include <stdio.h>
diff --git a/mkfs/f2fs_format_utils.h b/mkfs/f2fs_format_utils.h
index 807e7c327601..6a7f6874a951 100644
--- a/mkfs/f2fs_format_utils.h
+++ b/mkfs/f2fs_format_utils.h
@@ -6,8 +6,6 @@
  *
  * Dual licensed under the GPL or LGPL version 2 licenses.
  */
-#define _LARGEFILE64_SOURCE
-
 #include "f2fs_fs.h"
 
 extern struct f2fs_configuration c;
diff --git a/tools/Makefile.am b/tools/Makefile.am
index 6b03814463bc..7dfffb17a31f 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -1,7 +1,7 @@
 ## Makefile.am
 
 AM_CPPFLAGS = ${libuuid_CFLAGS} -I$(top_srcdir)/include
-AM_CFLAGS = -Wall
+AM_CFLAGS = -Wall -D_FILE_OFFSET_BITS=64
 sbin_PROGRAMS =
 if !WINDOWS
 sbin_PROGRAMS += fibmap.f2fs parse.f2fs
diff --git a/tools/f2fs_io/Makefile.am b/tools/f2fs_io/Makefile.am
index bc4f9d011331..f5227ce21b00 100644
--- a/tools/f2fs_io/Makefile.am
+++ b/tools/f2fs_io/Makefile.am
@@ -2,7 +2,7 @@
 
 if LINUX
 AM_CPPFLAGS = -I$(top_srcdir)/include
-AM_CFLAGS = -Wall
+AM_CFLAGS = -Wall -D_FILE_OFFSET_BITS=64
 sbin_PROGRAMS = f2fs_io
 f2fs_io_SOURCES = f2fs_io.c
 endif
diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
index 771fd165fb68..1f6549b46746 100644
--- a/tools/f2fs_io/f2fs_io.c
+++ b/tools/f2fs_io/f2fs_io.c
@@ -9,12 +9,6 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
-#ifndef _LARGEFILE_SOURCE
-#define _LARGEFILE_SOURCE
-#endif
-#ifndef _LARGEFILE64_SOURCE
-#define _LARGEFILE64_SOURCE
-#endif
 #ifndef O_LARGEFILE
 #define O_LARGEFILE 0
 #endif
diff --git a/tools/f2fs_io_parse.c b/tools/f2fs_io_parse.c
index 47f1194f7335..c3c1005ac27f 100644
--- a/tools/f2fs_io_parse.c
+++ b/tools/f2fs_io_parse.c
@@ -8,7 +8,6 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-#define _LARGEFILE64_SOURCE
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
diff --git a/tools/f2fscrypt.c b/tools/f2fscrypt.c
index 8640ffae1404..d5222fb4121b 100644
--- a/tools/f2fscrypt.c
+++ b/tools/f2fscrypt.c
@@ -7,15 +7,6 @@
  * Authors: Michael Halcrow <mhalcrow@google.com>,
  *	    Ildar Muslukhov <ildarm@google.com>
  */
-
-#ifndef _LARGEFILE_SOURCE
-#define _LARGEFILE_SOURCE
-#endif
-
-#ifndef _LARGEFILE64_SOURCE
-#define _LARGEFILE64_SOURCE
-#endif
-
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
diff --git a/tools/fibmap.c b/tools/fibmap.c
index bda8238d5ece..3acc77ba1f6a 100644
--- a/tools/fibmap.c
+++ b/tools/fibmap.c
@@ -1,13 +1,6 @@
 #if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__)
 #define _XOPEN_SOURCE 600
 #define _DARWIN_C_SOURCE
-#define _FILE_OFFSET_BITS 64
-#ifndef _LARGEFILE_SOURCE
-#define _LARGEFILE_SOURCE
-#endif
-#ifndef _LARGEFILE64_SOURCE
-#define _LARGEFILE64_SOURCE
-#endif
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
