diff --git a/sys/kern/tty.c b/sys/kern/tty.c
index 16901bbc273f..4bb1a1fdbd72 100644
--- a/sys/kern/tty.c
+++ b/sys/kern/tty.c
@@ -1053,7 +1053,7 @@ sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
 	return (error);
 }
 
-SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
+SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_NOLOCK,
 	0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs");
 
 /*