diff --git a/include/ntfs/layout.h b/include/ntfs/layout.h
index 486340c3..9782f426 100644
--- a/include/ntfs/layout.h
+++ b/include/ntfs/layout.h
@@ -27,9 +27,8 @@
 #include "endians.h"
 #include "support.h"
 
-/* The NTFS oem_id */
-#define magicNTFS	const_cpu_to_le64(0x202020205346544e)	/* "NTFS    " */
-#define NTFS_SB_MAGIC	0x5346544e				/* 'NTFS' */
+/* The NTFS oem_id "NTFS    " */
+#define NTFS_SB_MAGIC	const_cpu_to_le64(0x202020205346544eULL)
 
 /*
  * Location of bootsector on partition:
diff --git a/libntfs/bootsect.c b/libntfs/bootsect.c
index f2bafb4e..90a30f01 100644
--- a/libntfs/bootsect.c
+++ b/libntfs/bootsect.c
@@ -83,7 +83,7 @@ BOOL ntfs_boot_sector_is_ntfs(NTFS_BOOT_SECTOR *b,
 
 	/* Check OEMidentifier is "NTFS    " */
 	ntfs_log_debug("Checking OEMid... ");
-	if (b->oem_id != cpu_to_le64(0x202020205346544eULL)) /* "NTFS    " */
+	if (b->oem_id != NTFS_SB_MAGIC) /* "NTFS    " */
 		goto not_ntfs;
 	ntfs_log_debug("OK\n");