diff --git a/include/xen/platform_pci.h b/include/xen/platform_pci.h
index 590ccfd82645c951908951c24d5f46c111fd8936..a785a3b0c8c7d89d9a46e1a1d90300cb91da5308 100644
--- a/include/xen/platform_pci.h
+++ b/include/xen/platform_pci.h
@@ -16,12 +16,15 @@
 #define XEN_IOPORT_PROTOVER	(XEN_IOPORT_BASE + 2) /* 1 byte access (R) */
 #define XEN_IOPORT_PRODNUM	(XEN_IOPORT_BASE + 2) /* 2 byte access (W) */
 
-#define XEN_UNPLUG_ALL_IDE_DISKS 1
-#define XEN_UNPLUG_ALL_NICS 2
-#define XEN_UNPLUG_AUX_IDE_DISKS 4
-#define XEN_UNPLUG_ALL 7
-#define XEN_UNPLUG_UNNECESSARY 8
-#define XEN_UNPLUG_NEVER 16
+#define XEN_UNPLUG_ALL_IDE_DISKS	(1<<0)
+#define XEN_UNPLUG_ALL_NICS		(1<<1)
+#define XEN_UNPLUG_AUX_IDE_DISKS	(1<<2)
+#define XEN_UNPLUG_ALL			(XEN_UNPLUG_ALL_IDE_DISKS|\
+					 XEN_UNPLUG_ALL_NICS|\
+					 XEN_UNPLUG_AUX_IDE_DISKS)
+
+#define XEN_UNPLUG_UNNECESSARY 		(1<<16)
+#define XEN_UNPLUG_NEVER	 		(1<<17)
 
 static inline int xen_must_unplug_nics(void) {
 #if (defined(CONFIG_XEN_NETDEV_FRONTEND) || \