diff --git a/baseapp/abci.go b/baseapp/abci.go
index 8ce81d336637..864c1b583bdd 100644
--- a/baseapp/abci.go
+++ b/baseapp/abci.go
@@ -400,6 +400,7 @@ func (app *BaseApp) PrepareProposal(req *abci.RequestPrepareProposal) (resp *abc
 		Time:               req.Time,
 		ProposerAddress:    req.ProposerAddress,
 		NextValidatorsHash: req.NextValidatorsHash,
+		AppHash:            app.LastCommitID().Hash,
 	}
 	app.setState(execModePrepareProposal, header)
 
@@ -483,6 +484,7 @@ func (app *BaseApp) ProcessProposal(req *abci.RequestProcessProposal) (resp *abc
 		Time:               req.Time,
 		ProposerAddress:    req.ProposerAddress,
 		NextValidatorsHash: req.NextValidatorsHash,
+		AppHash:            app.LastCommitID().Hash,
 	}
 	app.setState(execModeProcessProposal, header)