diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h
index baa8171..32c0e83 100644
--- a/include/linux/uio_driver.h
+++ b/include/linux/uio_driver.h
@@ -35,7 +35,7 @@
 struct uio_mem {
 	const char		*name;
 	phys_addr_t		addr;
-	unsigned long		size;
+	resource_size_t		size;
 	int			memtype;
 	void __iomem		*internal_addr;
 	struct uio_map		*map;