diff --git a/abci/types/messages_test.go b/abci/types/messages_test.go
index d7fbf34d2..4f17f9f83 100644
--- a/abci/types/messages_test.go
+++ b/abci/types/messages_test.go
@@ -13,7 +13,7 @@ import (
 )
 
 func TestMarshalJSON(t *testing.T) {
-	b, err := json.Marshal(&ExecTxResult{})
+	b, err := json.Marshal(&ExecTxResult{Code: 1})
 	assert.NoError(t, err)
 	// include empty fields.
 	assert.True(t, strings.Contains(string(b), "code"))