diff --git a/sys/net/route/route_tables.c b/sys/net/route/route_tables.c
index 716c9c644c1..bfaf5889807 100644
--- a/sys/net/route/route_tables.c
+++ b/sys/net/route/route_tables.c
@@ -42,6 +42,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/systm.h>
 #include <sys/malloc.h>
 #include <sys/jail.h>
+#include <sys/proc.h>
 #include <sys/sysctl.h>
 #include <sys/syslog.h>
 #include <sys/kernel.h>