diff --git a/sys/kern/tty_cons.c b/sys/kern/tty_cons.c
index 2931dc502bf..632532486b9 100644
--- a/sys/kern/tty_cons.c
+++ b/sys/kern/tty_cons.c
@@ -47,6 +47,7 @@
 #include <sys/reboot.h>
 #include <sys/sysctl.h>
 #include <sys/tty.h>
+#include <sys/proc.h>
 #include <sys/uio.h>
 
 #include <machine/cpu.h>