diff --git a/sys/dev/usb/input/ukbd.c b/sys/dev/usb/input/ukbd.c
index 3f3de5188a5..2a8b2d014e5 100644
--- a/sys/dev/usb/input/ukbd.c
+++ b/sys/dev/usb/input/ukbd.c
@@ -1908,6 +1908,12 @@ ukbd_ioctl(keyboard_t *kbd, u_long cmd, caddr_t arg)
 {
 	int result;
 
+	/*
+	 * XXX Check of someone is calling us from a critical section:
+	 */
+	if (curthread->td_critnest != 0)
+		return (EDEADLK);
+
 	/*
 	 * XXX KDGKBSTATE, KDSKBSTATE and KDSETLED can be called from any
 	 * context where printf(9) can be called, which among other things