diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index 3bd5925..14e86af 100644
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -756,7 +756,7 @@ fc_remote_port_chkready(struct fc_rport *rport)
 	return result;
 }
 
-static inline u64 wwn_to_u64(u8 *wwn)
+static inline u64 wwn_to_u64(const u8 *wwn)
 {
 	return get_unaligned_be64(wwn);
 }