diff --git a/hw/pci.c b/hw/pci.c
index 63b1857f88..dceda0bdc5 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -1237,6 +1237,7 @@ static const pci_class_desc pci_class_descriptions[] =
     { 0x0c02, "SSA controller", "ssa"},
     { 0x0c03, "USB controller", "usb"},
     { 0x0c04, "Fibre channel controller", "fibre-channel"},
+    { 0x0c05, "SMBus"},
     { 0, NULL}
 };
 
diff --git a/hw/pci_ids.h b/hw/pci_ids.h
index 0bfc28f7fb..41f3570fb9 100644
--- a/hw/pci_ids.h
+++ b/hw/pci_ids.h
@@ -31,6 +31,7 @@
 #define PCI_CLASS_SYSTEM_OTHER           0x0880
 
 #define PCI_CLASS_SERIAL_USB             0x0c03
+#define PCI_CLASS_SERIAL_SMBUS           0x0c05
 
 #define PCI_CLASS_BRIDGE_HOST            0x0600
 #define PCI_CLASS_BRIDGE_ISA             0x0601