--- a/fdisk.h
+++ b/fdisk.h
@@ -2,6 +2,11 @@
    fdisk.h
 */
 
+#ifdef __linux__
+#define _FILE_OFFSET_BITS 64
+#define _LARGE_FILES
+#endif
+
 #define SECTOR_SIZE	512
 #define NETBSD_PARTITION 0xa5
 #define cround(n)	(((n) + display_factor * unit_flag) / display_factor)
