diff --git a/src/superio/smsc/smscsuperio/superio.c b/src/superio/smsc/smscsuperio/superio.c
index 2c20a09e92..66646b2bfb 100644
--- a/src/superio/smsc/smscsuperio/superio.c
+++ b/src/superio/smsc/smscsuperio/superio.c
@@ -61,6 +61,7 @@
 #define SCH3112		0x7c
 #define SCH5307		0x81	/* Rebranded LPC47B397(?) */
 #define SCH5027D	0x89
+#define SCH4304		0x90	/* SCH4304 */
 
 /* Register defines */
 #define DEVICE_ID_REG	0x20	/* Device ID register */
@@ -137,6 +138,7 @@ static const struct logical_devices {
 	{SCH3112,  {0, 3, 4,  5, -1,  7, -1,  -1, -1,  -1, -1, -1, 10, -1, -1}},
 	{SCH5307,  {0, 3, 4,  5, -1,  7, -1,  -1,  8,  -1, -1, -1, 10, -1, -1}},
 	{SCH5027D, {0, 3, 4,  5, -1,  7, -1,  -1, -1,  -1, -1, -1, 10, -1, 11}},
+	{SCH4304,  {0, 3, 4,  5, -1,  7, -1,  11, -1,  -1, -1, -1, 10, -1, -1}},
 };
 
 /**