diff --git a/Makefile b/Makefile
index 40dd06f..c0ecac7 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ BINDIR = $(PREFIX)/bin
 MANDIR = $(PREFIX)/share/man/man1
 
 LDFLAGS != pkg-config --libs libsodium 
-CFLAGS = -O3 -march=native -mtune=native -pipe -s -std=c99 -pedantic -Wall -D_DEFAULT_SOURCE
+CFLAGS = -Os -march=native -mtune=native -pipe -s -std=c99 -pedantic -Wall -D_DEFAULT_SOURCE
 
 SRC = apm.c