diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
index b449765b5cac..0bc7cba798a3 100644
--- a/include/linux/mfd/core.h
+++ b/include/linux/mfd/core.h
@@ -92,7 +92,7 @@ struct mfd_cell {
 	 * (above) when matching OF nodes with devices that have identical
 	 * compatible strings
 	 */
-	u64 of_reg;
+	const u64 of_reg;
 
 	/* Set to 'true' to use 'of_reg' (above) - allows for of_reg=0 */
 	bool use_of_reg;