diff --git a/src/sys/Makefile.inc b/src/sys/Makefile.inc
index 1ae3a26..da3bc26 100644
--- a/src/sys/Makefile.inc
+++ b/src/sys/Makefile.inc
@@ -2,5 +2,5 @@
 # global 'sys' options
 
 INCLUDES = -I../include
-CFLAGS = -Wall -nostdlib -fno-builtin -O2 -g -fno-exceptions
+CFLAGS = -Wall -nostdlib -fno-builtin -fomit-frame-pointer -fno-exceptions -O
 KERNEL = ubix.elf