diff --git a/sys/kern/tty_cons.c b/sys/kern/tty_cons.c
index 632532486b9..3180ad8bfcb 100644
--- a/sys/kern/tty_cons.c
+++ b/sys/kern/tty_cons.c
@@ -44,6 +44,7 @@
 #include <sys/conf.h>
 #include <sys/cons.h>
 #include <sys/kernel.h>
+#include <sys/proc.h>
 #include <sys/reboot.h>
 #include <sys/sysctl.h>
 #include <sys/tty.h>