diff --git a/hw/pci.c b/hw/pci.c
index b95c79440c..8252d21b95 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -417,6 +417,9 @@ void pci_default_write_config(PCIDevice *d,
         if (can_write) {
             /* Mask out writes to reserved bits in registers */
             switch (addr) {
+	    case 0x05:
+                val &= ~PCI_COMMAND_RESERVED_MASK_HI;
+                break;
             case 0x06:
                 val &= ~PCI_STATUS_RESERVED_MASK_LO;
                 break;
diff --git a/hw/pci.h b/hw/pci.h
index 95905db1ec..3b1caf5ca8 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -69,6 +69,11 @@ typedef struct PCIIORegion {
 
 #define PCI_STATUS_RESERVED_MASK_HI (PCI_STATUS_DEVSEL >> 8)
 
+/* Bits in the PCI Command Register (PCI 2.3 spec) */
+#define PCI_COMMAND_RESERVED	0xf800
+
+#define PCI_COMMAND_RESERVED_MASK_HI (PCI_COMMAND_RESERVED >> 8)
+
 struct PCIDevice {
     /* PCI config space */
     uint8_t config[256];