diff --git a/tools/offline_impl.ml b/tools/offline_impl.ml
index 48f4cbbe..c6e38015 100644
--- a/tools/offline_impl.ml
+++ b/tools/offline_impl.ml
@@ -60,8 +60,7 @@ let sign ~master_key ~input ~output =
 
 let revoke_denom ~output ~master_key ~h_denom =
   let* key = read_master_key_file master_key in
-  let* h_denom = B32.decode h_denom in
-  let h_denom_pub = Bin_type.DenominationHash.of_octets h_denom in
+  let* h_denom_pub = Bin_type.DenominationHash.of_b32 h_denom in
   let denom_revoke =
     let master_sig =
       let open Bin_sig.MasterDenominationKeyRevocation in
@@ -134,4 +133,5 @@ let global_fees ~output ~master_key ~start_date ~end_date ~history_fee
       }
   in
   let* s = Api.encode Api.GlobalFees.jsont global_fees in
-  write_file output s
+  let* () = write_file output s in
+  Ok ()