diff --git a/source/fdisk/pdiskio.h b/source/fdisk/pdiskio.h
index 1fd4584..dbed315 100644
--- a/source/fdisk/pdiskio.h
+++ b/source/fdisk/pdiskio.h
@@ -15,7 +15,7 @@
 #define OEM_IBM     0x00
 #define OEM_DRDOS   0xee
 #define OEM_NOVELL  0xef
-#define OEM_FRERDOS 0xfd
+#define OEM_FREEDOS 0xfd
 
 #define DLA_AUTO  0
 #define DLA_MSDOS 1