diff --git a/usr.sbin/mixer/Makefile b/usr.sbin/mixer/Makefile
index 0beb1c7c0c36..e50fe00a399e 100644
--- a/usr.sbin/mixer/Makefile
+++ b/usr.sbin/mixer/Makefile
@@ -1,6 +1,7 @@
 # $FreeBSD$
 
-PROG = mixer
+PROG=	mixer
+WARNS?=	2
 MAN=	mixer.8
 
 .include <bsd.prog.mk>
diff --git a/usr.sbin/mixer/mixer.c b/usr.sbin/mixer/mixer.c
index 9264c76f005f..68cb40efee5e 100644
--- a/usr.sbin/mixer/mixer.c
+++ b/usr.sbin/mixer/mixer.c
@@ -24,7 +24,7 @@ static const char rcsid[] =
 #include <unistd.h>
 #include <sys/soundcard.h>
 
-char *names[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
+const char *names[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
 
 void usage(int devmask, int recmask);
 int res_name(const char *name, int mask);