diff --git a/encoding/openapi/testdata/oneof.json b/encoding/openapi/testdata/oneof.json
index ce39ad4..83384fb 100644
--- a/encoding/openapi/testdata/oneof.json
+++ b/encoding/openapi/testdata/oneof.json
@@ -1,5 +1,6 @@
 {
    "openapi": "3.0.0",
+   "info": {},
    "components": {
       "schema": {
          "MyString": {