diff --git a/src/emu/machine/im6402.c b/src/emu/machine/im6402.c
index 0f24242dc1b..b0f986ea017 100644
--- a/src/emu/machine/im6402.c
+++ b/src/emu/machine/im6402.c
@@ -158,7 +158,9 @@ inline void im6402_device::transmit()
 
 im6402_device::im6402_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
 	: device_t(mconfig, IM6402, "Intersil IM6402", tag, owner, clock),
-		device_serial_interface(mconfig, *this)
+		device_serial_interface(mconfig, *this),
+		m_rrc_count(0),
+		m_trc_count(0)
 {
 }