diff --git a/include/linux/io.h b/include/linux/io.h
index f4f42faec68677a6fb032e7ccdf07b8b0bb130cb..8a18e75600ccb25b47f17decfacdef673de89713 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -24,7 +24,7 @@
 
 struct device;
 
-void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
+__visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
 void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
 
 #ifdef CONFIG_MMU