diff --git a/Makefile b/Makefile
index 395425c..2112c5f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 CC	?= gcc
 STRIP ?= strip
-CFLAGS ?= -O2
+CFLAGS ?= -Os
 LDFLAGS += -lxcb
 CFDEBUG = -g3 -pedantic -Wall -Wunused-parameter -Wlong-long\
 		  -Wsign-conversion -Wconversion -Wimplicit-function-declaration