diff --git a/src/emu/video/cdp1861.c b/src/emu/video/cdp1861.c
index 05b7dbc3ef8..9eba2bdf11a 100644
--- a/src/emu/video/cdp1861.c
+++ b/src/emu/video/cdp1861.c
@@ -103,6 +103,7 @@ void cdp1861_device::device_reset()
 
 	m_disp = 0;
 	m_dmaout = 0;
+	m_dispon = 0;
 
 	m_out_int_func(CLEAR_LINE);
 	m_out_dmao_func(CLEAR_LINE);