diff --git a/hw/pci.h b/hw/pci.h
index e4cc79a..e2c1fd8 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -177,9 +177,15 @@ typedef struct PCIIORegion {
 #define PCI_STATUS_RESERVED1	0x007
 #define PCI_STATUS_INT_STATUS	0x008
 #define PCI_STATUS_CAPABILITIES	0x010
+#ifndef PCI_STATUS_66MHZ
 #define PCI_STATUS_66MHZ	0x020
+#endif
+#ifndef PCI_STATUS_RESERVED2
 #define PCI_STATUS_RESERVED2	0x040
+#endif
+#ifndef PCI_STATUS_FAST_BACK
 #define PCI_STATUS_FAST_BACK	0x080
+#endif
 #define PCI_STATUS_DEVSEL	0x600
 
 #define PCI_STATUS_RESERVED_MASK_LO (PCI_STATUS_RESERVED1 | \
diff --git a/hw/pt-msi.h b/hw/pt-msi.h
index 9664f89..108ac8e 100644
--- a/hw/pt-msi.h
+++ b/hw/pt-msi.h
@@ -26,7 +26,9 @@
 /* MSI-X */
 #define  PCI_MSIX_ENABLE    0x8000
 #define  PCI_MSIX_MASK      0x4000
+#ifndef PCI_MSIX_TABSIZE
 #define  PCI_MSIX_TABSIZE   0x03ff
+#endif
 #define PCI_MSIX_TABLE      4
 #define PCI_MSIX_PBA        8
 #define  PCI_MSIX_BIR       0x7