diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
index e8bcad641d8c2..faeea7abd688f 100644
--- a/include/linux/mfd/core.h
+++ b/include/linux/mfd/core.h
@@ -72,7 +72,7 @@ struct mfd_cell {
 	int			(*resume)(struct platform_device *dev);
 
 	/* platform data passed to the sub devices drivers */
-	void			*platform_data;
+	const void		*platform_data;
 	size_t			pdata_size;
 
 	/* Matches ACPI */