diff --git a/proto/tendermint/abci/types.proto b/proto/tendermint/abci/types.proto
index 6071b1bcc..f9fc73b48 100644
--- a/proto/tendermint/abci/types.proto
+++ b/proto/tendermint/abci/types.proto
@@ -133,6 +133,8 @@ message RequestPrepareProposal {
   int64                     height               = 5;
   google.protobuf.Timestamp time                 = 6 [(gogoproto.nullable) = false, (gogoproto.stdtime) = true];
   bytes                     next_validators_hash = 7;
+  // address of the public key of the validator proposing the block.
+  bytes proposer_address = 8;
 }
 
 message RequestProcessProposal {
diff --git a/proto/tendermint/abci/types.proto.intermediate b/proto/tendermint/abci/types.proto.intermediate
index 7f71795c0..c752cd87b 100644
--- a/proto/tendermint/abci/types.proto.intermediate
+++ b/proto/tendermint/abci/types.proto.intermediate
@@ -134,6 +134,8 @@ message RequestPrepareProposal {
   int64                     height               = 5;
   google.protobuf.Timestamp time                 = 6 [(gogoproto.nullable) = false, (gogoproto.stdtime) = true];
   bytes                     next_validators_hash = 7;
+  // address of the public key of the validator proposing the block.
+  bytes proposer_address = 8;
 }
 
 message RequestProcessProposal {