diff --git a/src/mame/machine/taitoio.cpp b/src/mame/machine/taitoio.cpp
index 823231d2ffc..d7b7270be4b 100644
--- a/src/mame/machine/taitoio.cpp
+++ b/src/mame/machine/taitoio.cpp
@@ -58,8 +58,8 @@ DEFINE_DEVICE_TYPE(TC0220IOC, tc0220ioc_device, "tc0220ioc", "Taito TC0220IOC")
 
 tc0220ioc_device::tc0220ioc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
 	device_t(mconfig, TC0220IOC, tag, owner, clock),
-	m_port(0),
 	m_regs{ 0, 0, 0, 0, 0, 0, 0, 0 },
+	m_port(0),
 	m_watchdog(*this, "watchdog"),
 	m_read_0_cb(*this),
 	m_read_1_cb(*this),