diff --git a/drivers/mfd/cs42l43.c b/drivers/mfd/cs42l43.c
index 4e2bc5ad244a..65a331481d97 100644
--- a/drivers/mfd/cs42l43.c
+++ b/drivers/mfd/cs42l43.c
@@ -55,8 +55,8 @@
 struct cs42l43_patch_header {
 	__le16 version;
 	__le16 size;
-	u8 reserved;
-	u8 secure;
+	__u8 reserved;
+	__u8 secure;
 	__le16 bss_size;
 	__le32 apply_addr;
 	__le32 checksum;