diff --git a/include/linux/pci.h b/include/linux/pci.h
index b0e2447..7004dde 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -75,6 +75,7 @@
 #define PCI_D2		((pci_power_t __force) 2)
 #define PCI_D3hot	((pci_power_t __force) 3)
 #define PCI_D3cold	((pci_power_t __force) 4)
+#define PCI_UNKNOWN	((pci_power_t __force) 5)
 #define PCI_POWER_ERROR	((pci_power_t __force) -1)
 
 /*