diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 589e0e7..3314843 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -102,7 +102,7 @@ struct resource {
 
 /* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
 #define IORESOURCE_PCI_FIXED		(1<<4)	/* Do not move resource */
-
+#define IORESOURCE_PCI_CS		(1<<5)	/* PCI configuration space */
 
 /* helpers to define resources */
 #define DEFINE_RES_NAMED(_start, _size, _name, _flags)			\