diff --git a/sys/dev/misc/dcons/dcons_os.c b/sys/dev/misc/dcons/dcons_os.c
--- a/sys/dev/misc/dcons/dcons_os.c
+++ b/sys/dev/misc/dcons/dcons_os.c
@@ -350,6 +350,8 @@
 		}
 		lwkt_reltoken(&tp->t_token);
 	}
+	if (poll_hz == 0)
+		poll_hz = 1;
 	polltime = hz / poll_hz;
 	if (polltime < 1)
 		polltime = 1;