diff --git a/sbin/adjkerntz/Makefile b/sbin/adjkerntz/Makefile
index cf4046188d4c..d254dcc2a8d2 100644
--- a/sbin/adjkerntz/Makefile
+++ b/sbin/adjkerntz/Makefile
@@ -1,7 +1,7 @@
 # $FreeBSD$
 
 PROG=   adjkerntz
+WARNS?=	2
 MAN=	adjkerntz.8
-CFLAGS+= -Wall
 
 .include <bsd.prog.mk>
diff --git a/sbin/adjkerntz/adjkerntz.c b/sbin/adjkerntz/adjkerntz.c
index 743782a66f5d..63d4fa31862a 100644
--- a/sbin/adjkerntz/adjkerntz.c
+++ b/sbin/adjkerntz/adjkerntz.c
@@ -65,9 +65,16 @@ static const char rcsid[] =
 
 #define REPORT_PERIOD (30*60)
 
+static void fake __P((int));
 static void usage __P((void));
 
-void fake() {}
+static void
+fake(unused)
+	int unused __unused;
+{
+
+	/* Do nothing. */
+}
 
 int main(argc, argv)
 	int argc;