diff --git a/Makefile b/Makefile
index d85718a..3df3ccc 100755
--- a/Makefile
+++ b/Makefile
@@ -44,7 +44,7 @@ OBJS = $(addprefix $(BUILD)/, \
 OBJS += $(addprefix $(BUILD)/, diskio.o ff.o ffunicode.o)
 
 ARCH := -march=armv4t -mtune=arm7tdmi -mthumb -mthumb-interwork
-CFLAGS = $(ARCH) -O2 -nostdlib -ffunction-sections -fdata-sections -fomit-frame-pointer -fno-inline -std=gnu11# -Wall
+CFLAGS = $(ARCH) -Os -nostdlib -ffunction-sections -fdata-sections -fomit-frame-pointer -fno-inline -std=gnu11# -Wall
 LDFLAGS = $(ARCH) -nostartfiles -lgcc -Wl,--nmagic,--gc-sections
 
 .PHONY: all clean
diff --git a/ipl/ffconf.h b/ipl/ffconf.h
index b15741c..4926040 100755
--- a/ipl/ffconf.h
+++ b/ipl/ffconf.h
@@ -15,7 +15,7 @@
 /  and optional writing functions as well. */
 
 
-#define FF_FS_MINIMIZE	0
+#define FF_FS_MINIMIZE	3
 /* This option defines minimization level to remove some basic API functions.
 /
 /   0: Basic functions are fully enabled.