diff --git a/eosio.msig/include/eosio.msig/eosio.msig.hpp b/eosio.msig/include/eosio.msig/eosio.msig.hpp
index 1544f2e02..a8c506e78 100644
--- a/eosio.msig/include/eosio.msig/eosio.msig.hpp
+++ b/eosio.msig/include/eosio.msig/eosio.msig.hpp
@@ -14,7 +14,7 @@ namespace eosio {
                ignore<std::vector<permission_level>> requested, ignore<transaction> trx);
          [[eosio::action]]
          void approve( name proposer, name proposal_name, permission_level level,
-                       const eosio::binary_extension<eosio::digest256>& proposal_hash );
+                       const eosio::binary_extension<eosio::checksum256>& proposal_hash );
          [[eosio::action]]
          void unapprove( name proposer, name proposal_name, permission_level level );
          [[eosio::action]]
diff --git a/eosio.msig/src/eosio.msig.cpp b/eosio.msig/src/eosio.msig.cpp
index d04d5b17a..0b682b6c9 100644
--- a/eosio.msig/src/eosio.msig.cpp
+++ b/eosio.msig/src/eosio.msig.cpp
@@ -59,7 +59,7 @@ void multisig::propose( ignore<name> proposer,
 }
 
 void multisig::approve( name proposer, name proposal_name, permission_level level,
-                        const eosio::binary_extension<eosio::digest256>& proposal_hash )
+                        const eosio::binary_extension<eosio::checksum256>& proposal_hash )
 {
    require_auth( level );