diff --git a/makefile b/makefile
index c5320d8..7cc6d5d 100644
--- a/makefile
+++ b/makefile
@@ -15,7 +15,7 @@
 # If you need <inttypes.h> copy sun-inttypes.h to inttypes.h.
 #
 #CC=cc
-CFLAGS=-g -I.
+CFLAGS=-g -O -I.
 LD=cc
 LDFLAGS=
 LDTAIL=