diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 589e0e75efae..bfee885791c2 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -31,6 +31,7 @@ struct resource {
 #define IORESOURCE_TYPE_BITS	0x00001f00	/* Resource type */
 #define IORESOURCE_IO		0x00000100
 #define IORESOURCE_MEM		0x00000200
+#define IORESOURCE_REG		0x00000300	/* Register offsets */
 #define IORESOURCE_IRQ		0x00000400
 #define IORESOURCE_DMA		0x00000800
 #define IORESOURCE_BUS		0x00001000