diff --git a/sbin/dmesg/dmesg.c b/sbin/dmesg/dmesg.c
index 4b6bdb61fc9a..8cb4f696b869 100644
--- a/sbin/dmesg/dmesg.c
+++ b/sbin/dmesg/dmesg.c
@@ -44,6 +44,7 @@ static char sccsid[] = "@(#)dmesg.c	8.1 (Berkeley) 6/5/93";
 #include <sys/cdefs.h>
 #include <sys/msgbuf.h>
 
+#include <err.h>
 #include <fcntl.h>
 #include <kvm.h>
 #include <limits.h>