diff --git a/common/Makefile b/common/Makefile
index 0bef1ae7..85888a90 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -1,5 +1,5 @@
 CC=gcc
-CFLAGS=-Wall -g
+CFLAGS=-Wall -g -O3
 all:	meminfo-writer
 meminfo-writer: meminfo-writer.o
 	$(CC) -g -o meminfo-writer meminfo-writer.o -lxenstore