diff --git a/firmware/ext/integer.h b/firmware/ext/integer.h
index 16ad408233..f254b2a028 100644
--- a/firmware/ext/integer.h
+++ b/firmware/ext/integer.h
@@ -2,8 +2,8 @@
 /* Integer type definitions for FatFs module */
 /*-------------------------------------------*/
 
-#ifndef _INTEGER
-#define _INTEGER
+#ifndef _FF_INTEGER
+#define _FF_INTEGER
 
 #ifdef _WIN32	/* FatFs development platform */
 
@@ -12,24 +12,20 @@
 
 #else			/* Embedded platform */
 
-/* These types must be 16-bit, 32-bit or larger integer */
-typedef int				INT;
-typedef unsigned int	UINT;
-
-/* These types must be 8-bit integer */
-typedef char			CHAR;
-typedef unsigned char	UCHAR;
+/* This type MUST be 8 bit */
 typedef unsigned char	BYTE;
 
-/* These types must be 16-bit integer */
+/* These types MUST be 16 bit */
 typedef short			SHORT;
-typedef unsigned short	USHORT;
 typedef unsigned short	WORD;
 typedef unsigned short	WCHAR;
 
-/* These types must be 32-bit integer */
+/* These types MUST be 16 bit or 32 bit */
+typedef int				INT;
+typedef unsigned int	UINT;
+
+/* These types MUST be 32 bit */
 typedef long			LONG;
-typedef unsigned long	ULONG;
 typedef unsigned long	DWORD;
 
 #endif