diff --git a/FatFs/ff.c b/FatFs/ff.c
index 580a916f..b658786e 100644
--- a/FatFs/ff.c
+++ b/FatFs/ff.c
@@ -22,6 +22,8 @@
 #include "ff.h"			/* Declarations of FatFs API */
 #include "diskio.h"		/* Declarations of device I/O functions */
 
+// Use size optimization
+#pragma GCC optimize ("Os")
 
 /*--------------------------------------------------------------------------