diff --git a/src/mame/drivers/raiden2.cpp b/src/mame/drivers/raiden2.cpp
index c16d3b7dfff..ade829fcdac 100644
--- a/src/mame/drivers/raiden2.cpp
+++ b/src/mame/drivers/raiden2.cpp
@@ -1539,7 +1539,7 @@ MACHINE_CONFIG_START(raiden2_state::zeroteam)
 	MCFG_YM3812_IRQ_HANDLER(WRITELINE("seibu_sound", seibu_sound_device, fm_irqhandler))
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
 
-	MCFG_DEVICE_ADD("oki", OKIM6295, 1320000/* ? */, okim6295_device::PIN7_LOW)
+	MCFG_DEVICE_ADD("oki", OKIM6295, XTAL(28'636'363)/28, okim6295_device::PIN7_LOW)
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.40)
 
 	MCFG_DEVICE_ADD("seibu_sound", SEIBU_SOUND, 0)