diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 510e4ac..71ab79d 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -51,6 +51,7 @@
 #define IORESOURCE_STARTALIGN	0x00080000	/* start field is alignment */
 
 #define IORESOURCE_MEM_64	0x00100000
+#define IORESOURCE_WINDOW	0x00200000	/* forwarded by bridge */
 
 #define IORESOURCE_EXCLUSIVE	0x08000000	/* Userland may not map this resource */
 #define IORESOURCE_DISABLED	0x10000000