diff --git a/flight/Libraries/FatFS/diskio.c b/flight/Libraries/FatFS/diskio.c
index 17ef3d957..80a47fb41 100644
--- a/flight/Libraries/FatFS/diskio.c
+++ b/flight/Libraries/FatFS/diskio.c
@@ -924,7 +924,7 @@ DRESULT disk_ioctl (
 /*-----------------------------------------------------------------------*/
 /* This function must be called in period of 10ms                        */
 
-RAMFUNC void disk_timerproc (void)
+void disk_timerproc (void)
 {
 	static socket_state_t pv;
 	socket_state_t ns;
diff --git a/flight/Libraries/FatFS/diskio.h b/flight/Libraries/FatFS/diskio.h
index ade017272..b50574787 100644
--- a/flight/Libraries/FatFS/diskio.h
+++ b/flight/Libraries/FatFS/diskio.h
@@ -36,11 +36,8 @@ DRESULT disk_write (BYTE, const BYTE*, DWORD, BYTE);
 #endif
 DRESULT disk_ioctl (BYTE, BYTE, void*);
 
-// mthomas:
-#ifndef RAMFUNC
-#define RAMFUNC
-#endif
-RAMFUNC void    disk_timerproc (void);
+
+void    disk_timerproc (void);
 
 
 /* Disk Status Bits (DSTATUS) */