diff --git a/build/pdp10-kl/run b/build/pdp10-kl/run
index 28bafaa3..78cfa71d 100644
--- a/build/pdp10-kl/run
+++ b/build/pdp10-kl/run
@@ -7,7 +7,7 @@ set tua dis
 set lpt dis
 set dc disable
 set tty enabled
-set tty 8b lines=15
+set tty 8b
 at -u tty 10007
 # VT52
 at -u tty line=14,10018 speed=9600