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-rw-r--r--fdisk/common.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/fdisk/common.h b/fdisk/common.h
index f3886395b..a2b9f1cdf 100644
--- a/fdisk/common.h
+++ b/fdisk/common.h
@@ -6,7 +6,7 @@
#define BLKGETSIZE _IO(0x12,96) /* return device size */
#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
#define BLKSSZGET _IO(0x12,104) /* get block device sector size */
-#define BLKGETSIZE64 _IOR(0x12,114,8) /* 8 = sizeof(u64) */
+#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* size in bytes */
/* including <linux/hdreg.h> also fails */
struct hd_geometry {