diff --git a/src/emu/machine/mm74c922.c b/src/emu/machine/mm74c922.c
index b94d678e46d..a9a943b0eec 100644
--- a/src/emu/machine/mm74c922.c
+++ b/src/emu/machine/mm74c922.c
@@ -116,8 +116,10 @@ inline void mm74c922_device::detect_keypress()
 
 mm74c922_device::mm74c922_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
 	: device_t(mconfig, MM74C922, "MM74C922", tag, owner, clock),
+		m_inhibit(0),
 		m_x(0),
 		m_y(0),
+		m_da(0),
 		m_next_da(0)
 {
 }