diff --git a/OpenAuraSDK/OpenAuraSDK.cpp b/OpenAuraSDK/OpenAuraSDK.cpp
index 67b3b419..bf9e3d4c 100644
--- a/OpenAuraSDK/OpenAuraSDK.cpp
+++ b/OpenAuraSDK/OpenAuraSDK.cpp
@@ -45,14 +45,15 @@ std::vector<i2c_smbus_interface *> busses;
 *                                                                                          *
 \******************************************************************************************/
 
-#define SIO_NCT5577_ID      0xC333  /* Device ID for NCT5577D       */
-#define SIO_NCT6102_ID      0x1061  /* Device ID for NCT6102D/6106D */
-#define SIO_NCT6793_ID      0xd121  /* Device ID for NCT6793D       */
-#define SIO_NCT6796_ID      0xd421  /* Device ID for NCT6796D       */
-#define SIO_REG_LOGDEV      0x07    /* Logical Device Register      */
-#define SIO_REG_DEVID       0x20    /* Device ID Register           */
-#define SIO_REG_SMBA        0x62    /* SMBus Base Address Register  */
-#define SIO_LOGDEV_SMBUS    0x0B    /* Logical Device for SMBus     */
+#define SIO_NCT5577_ID      0xC330  /* Device ID for NCT5577D (C333)        */
+#define SIO_NCT6102_ID      0x1060  /* Device ID for NCT6102D/6106D (1061)  */
+#define SIO_NCT6793_ID      0xd120  /* Device ID for NCT6793D (D121)        */
+#define SIO_NCT6796_ID      0xd420  /* Device ID for NCT6796D (D421)        */
+#define SIO_REG_LOGDEV      0x07    /* Logical Device Register              */
+#define SIO_REG_DEVID       0x20    /* Device ID Register                   */
+#define SIO_REG_SMBA        0x62    /* SMBus Base Address Register          */
+#define SIO_LOGDEV_SMBUS    0x0B    /* Logical Device for SMBus             */
+#define SIO_ID_MASK         0xFFF8  /* Device ID mask                       */
 
 
 /******************************************************************************************\
@@ -117,7 +118,7 @@ void DetectNuvotonI2CBusses()
 
     int val = (superio_inb(sioaddr, SIO_REG_DEVID) << 8) | superio_inb(sioaddr, SIO_REG_DEVID + 1);
 
-    switch (val)
+    switch (val & SIO_ID_MASK)
     {
     case SIO_NCT5577_ID:
     case SIO_NCT6102_ID:
@@ -133,7 +134,7 @@ void DetectNuvotonI2CBusses()
         ((i2c_smbus_nuvoton_nct6793d*)bus)->nuvoton_nct6793d_smba = smba;
 
         // Set device name string
-        switch (val)
+        switch (val & SIO_ID_MASK)
         {
         case SIO_NCT5577_ID:
             sprintf(bus->device_name, "Nuvoton NCT5577D SMBus at %X", smba);