diff --git a/fsck/f2fs.h b/fsck/f2fs.h
index eacfd42..e5130ba 100644
--- a/fsck/f2fs.h
+++ b/fsck/f2fs.h
@@ -15,6 +15,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <stdbool.h>
+#include <stddef.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <string.h>
@@ -37,7 +38,6 @@
 		typecheck(unsigned long long, b) &&                     \
 		((long long)((a) - (b)) > 0))
 
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #define container_of(ptr, type, member) ({			\
 	const typeof(((type *)0)->member) * __mptr = (ptr);	\
 	(type *)((char *)__mptr - offsetof(type, member)); })
diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index 568573a..1beb78b 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -19,6 +19,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <stddef.h>
 #include <string.h>
 #include <time.h>
 #ifdef HAVE_CONFIG_H
@@ -915,10 +916,6 @@ static_assert(sizeof(struct f2fs_extent) == 12, "");
 #define F2FS_PIN_FILE		0x40	/* file should not be gced */
 #define F2FS_COMPRESS_RELEASED	0x80	/* file released compressed blocks */
 
-#if !defined(offsetof)
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
-#endif
-
 #define F2FS_EXTRA_ISIZE_OFFSET				\
 	offsetof(struct f2fs_inode, i_extra_isize)
 #define F2FS_TOTAL_EXTRA_ATTR_SIZE			\