diff --git a/src/emu/machine/wd17xx.c b/src/emu/machine/wd17xx.c
index 386c110b780..0123042b6e8 100644
--- a/src/emu/machine/wd17xx.c
+++ b/src/emu/machine/wd17xx.c
@@ -2061,6 +2061,7 @@ void wd1770_device::device_reset()
 	m_hd = 0;
 	m_hld_count = 0;
 	m_sector = 1;
+	m_last_command_data = 0;
 	wd17xx_command_restore();
 }