diff --git a/Makefile b/Makefile
index 2ee42aa..244e115 100644
--- a/Makefile
+++ b/Makefile
@@ -36,9 +36,9 @@ INCLUDES	:=
 # options for code generation
 #---------------------------------------------------------------------------------
 CFLAGS	:=  -std=gnu11 -mrvl -mcpu=750 -meabi -mhard-float -ffast-math -fno-builtin \
-		    -O0 -Wall -Wextra -Wno-unused-parameter -Wno-strict-aliasing $(INCLUDE)
+		    -Os -Wall -Wextra -Wno-unused-parameter -Wno-strict-aliasing $(INCLUDE)
 CXXFLAGS := -std=gnu++11 -mrvl -mcpu=750 -meabi -mhard-float -ffast-math \
-		    -O0 -Wall -Wextra -Wno-unused-parameter -Wno-strict-aliasing $(INCLUDE)
+		    -Os -Wall -Wextra -Wno-unused-parameter -Wno-strict-aliasing $(INCLUDE)
 ASFLAGS	:= -mregnames
 LDFLAGS	:= -nostartfiles -Wl,--gc-sections