diff --git a/Makefile b/Makefile
index 2c3e23b..d174b41 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,5 @@
 CC?=gcc
+CFLAGS?=-Os
 CFLAGS+=-D_GNU_SOURCE
 LDLIBS+=-lskarnet
 PREFIX?=/usr