diff --git a/src/binary_formats.ml b/src/binary_formats.ml
index 4a7f04ee..2e4089f0 100644
--- a/src/binary_formats.ml
+++ b/src/binary_formats.ml
@@ -142,10 +142,6 @@ module UTIL = struct
       hash s
   end
 
-  module MK_HASH_64 () = struct
-    include HHH_64
-  end
-
   module HHH_32 = struct
     type t = { hash: Digestif.SHA256.t }
 
@@ -186,11 +182,7 @@ module UTIL = struct
       hash s
   end
 
-  module MK_HASH_32 () = struct
-    include HHH_32
-  end
-
-  module MK_SRC_HASH_64 (M : sig
+  module MK_HASH_64_of_src (M : sig
     type src
 
     val to_octets : src -> string
@@ -205,7 +197,7 @@ module UTIL = struct
     let hash src = hash (M.to_octets src)
   end
 
-  module MK_SRC_HASH_32 (M : sig
+  module MK_HASH_32_of_src (M : sig
     type src
 
     val to_octets : src -> string
@@ -225,7 +217,7 @@ include UTIL
 
 (* -- Cryptographic primitives -- *)
 
-module DenominationHash = MK_SRC_HASH_32 (struct
+module DenominationHash = MK_HASH_32_of_src (struct
   type src = Crypto.RsaPublicKey.t
 
   let to_octets = Crypto.RsaPublicKey.to_octets
@@ -246,17 +238,17 @@ end
 
 (* Hash over a full payto://-URI, including receiver-name
    (and possibly BIC and other optional fields). *)
-module FullPaytoHash = MK_HASH_32 ()
+module FullPaytoHash = Hash_32
 
 (* Hash over a normalized payto://-URI, including all optional
    fields and also with account-part canonicalized (so no BIC). *)
-module NormalizedPaytoHash = MK_HASH_32 ()
-module PrivateContractHash = MK_HASH_64 ()
-module ExtensionsPolicyHash = MK_HASH_64 ()
-module MerchantWireHash = MK_HASH_64 ()
+module NormalizedPaytoHash = Hash_32
+module PrivateContractHash = Hash_64
+module ExtensionsPolicyHash = Hash_64
+module MerchantWireHash = Hash_64
 
 (* TODO missing doc *)
-module AgeCommitmentHash = MK_HASH_64 ()
+module AgeCommitmentHash = Hash_64
 
 (* Hash over:
      a) the hash of the denomination's public key,
@@ -264,16 +256,16 @@ module AgeCommitmentHash = MK_HASH_64 ()
      c) cipher-dependant blinded information.
    See implementation of `TALER_CoinEvHash`
    in libtalerexchange for details. *)
-module BlindedCoinHash = MK_HASH_64 ()
-module CoinPubHash = MK_HASH_64 ()
-module OutputCommitmentHash = MK_HASH_64 ()
+module BlindedCoinHash = Hash_64
+module CoinPubHash = Hash_64
+module OutputCommitmentHash = Hash_64
 
 (* This is the running SHA512-hash over all
    `TALER_BlindedCoinHashP` values of an array of coins.
    Note that each `TALER_BlindedCoinHashP` itself
    captures the hash of the corresponding denomination's
    public key. *)
-module HashPlanchetsP = MK_HASH_64 ()
+module HashPlanchetsP = Hash_64
 
 (* --- Keys --- *)