diff --git a/usr.sbin/kgmon/Makefile b/usr.sbin/kgmon/Makefile
index 964c79b542f6..bf19401b494d 100644
--- a/usr.sbin/kgmon/Makefile
+++ b/usr.sbin/kgmon/Makefile
@@ -3,6 +3,7 @@
 
 PROG=	kgmon
 MAN=	kgmon.8
+WARNS?=	2
 
 # This program may safely be run setuid-root to allow non-root
 # users to start, stop, and reset profiling buffers.