diff --git a/include/linux/io.h b/include/linux/io.h
index 45a9c94..9e419eb 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -22,6 +22,8 @@
 #include <asm/io.h>
 #include <asm/page.h>
 
+struct device;
+
 void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
 void __iowrite64_copy(void __iomem *to, const void *from, size_t count);