diff --git a/Makefile b/Makefile
index 6851c8c90..091cba61f 100644
--- a/Makefile
+++ b/Makefile
@@ -36,7 +36,7 @@ MID_BUILDDIR = $(OBJ_DIR)/$(MID_SUBDIR)
 ASFLAGS := -mcpu=arm7tdmi
 
 CC1             := tools/agbcc/bin/agbcc$(EXE)
-override CFLAGS += -mthumb-interwork -Wimplicit -Wparentheses -Werror -Os -fhex-asm
+override CFLAGS += -mthumb-interwork -Wimplicit -Wparentheses -Werror -O2 -fhex-asm
 
 CPPFLAGS := -I tools/agbcc/include -I tools/agbcc -iquote include