diff --git a/src/vnet/bier/bier.api b/src/vnet/bier/bier.api
index 30b0478..3356152 100644
--- a/src/vnet/bier/bier.api
+++ b/src/vnet/bier/bier.api
@@ -19,7 +19,7 @@
     This file defines vpp BIER control-plane API messages which are generally
     called through a shared memory interface.
 */
-option version = "1.2.0";
+option version = "1.2.1";
 import "vnet/fib/fib_types.api";
 
 /** \brief BIER Table Identifier
@@ -49,7 +49,7 @@
   u32 context;
   vl_api_bier_table_id_t bt_tbl_id;
   u32 bt_label;
-  u8 bt_is_add;
+  bool bt_is_add;
 };
 
 define bier_table_dump
@@ -90,8 +90,8 @@
 {
   u32 client_index;
   u32 context;
-  u8 br_is_add;
-  u8 br_is_replace;
+  bool br_is_add;
+  bool br_is_replace;
   vl_api_bier_route_t br_route;
 };
 
@@ -178,7 +178,7 @@
   u32 client_index;
   u32 context;
   u32 bdt_tbl_id;
-  u8 bdt_is_add;
+  bool bdt_is_add;
 };
 
 define bier_disp_table_dump
@@ -211,7 +211,7 @@
   u32 context;
   u16 bde_bp;
   u32 bde_tbl_id;
-  u8 bde_is_add;
+  bool bde_is_add;
   u8 bde_payload_proto;
   u8 bde_n_paths;
   vl_api_fib_path_t bde_paths[bde_n_paths];
@@ -229,7 +229,7 @@
   u32 context;
   u16 bde_bp;
   u32 bde_tbl_id;
-  u8 bde_is_add;
+  bool bde_is_add;
   u8 bde_payload_proto;
   u8 bde_n_paths;
   vl_api_fib_path_t bde_paths[bde_n_paths];