diff --git a/util/menu.s b/util/menu.s
index 9ef7c1a1..92efa4f0 100644
--- a/util/menu.s
+++ b/util/menu.s
@@ -321,6 +321,7 @@ do_diag:
 	jmp show_menu
 @enter:	cmp #13
 	bne @getchoice
+	sei
 	jsr ujsrfar
 	.word $C000
 	.byte BANK_DIAG