diff --git a/x/rollapp/types/codec.go b/x/rollapp/types/codec.go
index bd6db7f04..47b7c57d1 100644
--- a/x/rollapp/types/codec.go
+++ b/x/rollapp/types/codec.go
@@ -5,6 +5,7 @@ import (
 	cdctypes "github.com/cosmos/cosmos-sdk/codec/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/types/msgservice"
+	authzcodec "github.com/cosmos/cosmos-sdk/x/authz/codec"
 
 	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types/v1beta1"
 )
@@ -35,5 +36,15 @@ func RegisterInterfaces(registry cdctypes.InterfaceRegistry) {
 
 var (
 	Amino     = codec.NewLegacyAmino()
-	ModuleCdc = codec.NewProtoCodec(cdctypes.NewInterfaceRegistry())
+	ModuleCdc = codec.NewAminoCodec(Amino)
 )
+
+func init() {
+	RegisterCodec(Amino)
+	// Register all Amino interfaces and concrete types on the authz Amino codec so that this can later be
+	// used to properly serialize MsgGrant and MsgExec instances
+	sdk.RegisterLegacyAminoCodec(Amino)
+	RegisterCodec(authzcodec.Amino)
+
+	Amino.Seal()
+}