diff --git a/src/mame/drivers/konamigx.c b/src/mame/drivers/konamigx.c
index 84d18aea6ba..d3659878cf3 100644
--- a/src/mame/drivers/konamigx.c
+++ b/src/mame/drivers/konamigx.c
@@ -1640,6 +1640,7 @@ static MACHINE_CONFIG_START( konamigx, konamigx_state )
 	MCFG_K055555_ADD("k055555")
 
 	MCFG_DEVICE_ADD("k054338", K054338, 0)
+	MCFG_K054338_MIXER("k055555")
 	MCFG_K054338_SET_SCREEN("screen")
 	MCFG_K054338_ALPHAINV(1)
 
diff --git a/src/mame/video/k054338.c b/src/mame/video/k054338.c
index 937e76651a6..f09ae3f83b9 100644
--- a/src/mame/video/k054338.c
+++ b/src/mame/video/k054338.c
@@ -24,9 +24,9 @@ k054338_device::k054338_device(const machine_config &mconfig, const char *tag, d
 	m_alpha_inv(0),
 	m_k055555_tag(NULL),
 	m_generic_paletteram_32(*this, "^paletteram")
-	//m_regs[32],
-	//m_shd_rgb[9],
 {
+	memset(&m_regs, 0, sizeof(m_regs));
+	memset(&m_shd_rgb, 0, sizeof(m_shd_rgb));
 }
 
 //-------------------------------------------------