diff --git a/src/devices/bus/hp_dio/human_interface.cpp b/src/devices/bus/hp_dio/human_interface.cpp
index 75f7f1c1296..61ca1531fb6 100644
--- a/src/devices/bus/hp_dio/human_interface.cpp
+++ b/src/devices/bus/hp_dio/human_interface.cpp
@@ -138,6 +138,7 @@ void human_interface_device::device_reset()
 	m_ppoll_sc = 0;
 	m_gpib_irq_line = false;
 	m_kbd_nmi = false;
+	m_old_latch_enable = true;
 	m_rtc->cs1_w(ASSERT_LINE);
 	m_rtc->cs2_w(CLEAR_LINE);
 	m_rtc->write_w(CLEAR_LINE);