diff --git a/state/execution.go b/state/execution.go
index 59d18b48b..34e435627 100644
--- a/state/execution.go
+++ b/state/execution.go
@@ -199,6 +199,7 @@ func execBlockOnProxyApp(logger log.Logger, proxyAppConn proxy.AppConnConsensus,
 	byzantineVals := make([]abci.Evidence, len(block.Evidence.Evidence))
 	for i, ev := range block.Evidence.Evidence {
 		byzantineVals[i] = abci.Evidence{
+			Type:   []byte(ev.String()),
 			PubKey: ev.Address(), // XXX
 			Height: ev.Height(),
 		}
diff --git a/state/execution_test.go b/state/execution_test.go
index 170bf2665..87b4a31a7 100644
--- a/state/execution_test.go
+++ b/state/execution_test.go
@@ -110,10 +110,10 @@ func TestBeginBlockByzantineValidators(t *testing.T) {
 		expectedByzantineValidators []abci.Evidence
 	}{
 		{"none byzantine", []types.Evidence{}, []abci.Evidence{}},
-		{"one byzantine", []types.Evidence{ev1}, []abci.Evidence{{nil, ev1.Address(), ev1.Height(), int64(0)}}},
+		{"one byzantine", []types.Evidence{ev1}, []abci.Evidence{{[]byte(ev1.String()), ev1.Address(), ev1.Height(), int64(0)}}},
 		{"multiple byzantine", []types.Evidence{ev1, ev2}, []abci.Evidence{
-			{nil, ev1.Address(), ev1.Height(), int64(0)},
-			{nil, ev2.Address(), ev2.Height(), int64(0)}}},
+			{[]byte(ev1.String()), ev1.Address(), ev1.Height(), int64(0)},
+			{[]byte(ev2.String()), ev2.Address(), ev2.Height(), int64(0)}}},
 	}
 
 	for _, tc := range testCases {
diff --git a/types/evidence.go b/types/evidence.go
index bbfd6c81b..d926de9a4 100644
--- a/types/evidence.go
+++ b/types/evidence.go
@@ -40,7 +40,7 @@ type Evidence interface {
 	Verify(chainID string) error // verify the evidence
 	Equal(Evidence) bool         // check equality of evidence
 
-	String() string
+	String() string // used as type in abci.Evidence
 }
 
 func RegisterEvidences(cdc *amino.Codec) {