diff --git a/src/emu/sound/namco.c b/src/emu/sound/namco.c
index 2d182522e62..8977afad66f 100644
--- a/src/emu/sound/namco.c
+++ b/src/emu/sound/namco.c
@@ -56,12 +56,12 @@ namco_device::namco_device(const machine_config &mconfig, const char *tag, devic
 }
 
 namco_15xx_device::namco_15xx_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
-	:namco_audio_device(mconfig, NAMCO_15XX, "Namco 15XX", tag, owner, clock, "namco 15xx", __FILE__)
+	:namco_audio_device(mconfig, NAMCO_15XX, "Namco 15XX", tag, owner, clock, "namco_15xx", __FILE__)
 {
 }
 
 namco_cus30_device::namco_cus30_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
-	: namco_audio_device(mconfig, NAMCO_CUS30, "Namco CUS30", tag, owner, clock, "namco cus30", __FILE__)
+	: namco_audio_device(mconfig, NAMCO_CUS30, "Namco CUS30", tag, owner, clock, "namco_cus30", __FILE__)
 {
 }