diff --git a/test/core/thing_description_test.dart b/test/core/thing_description_test.dart
index 7868b29f..1ea75929 100644
--- a/test/core/thing_description_test.dart
+++ b/test/core/thing_description_test.dart
@@ -59,6 +59,7 @@ void main() {
             "forms": [
               {
                 "href": "https://example.org",
+                "contentType": "application/cbor",
               }
             ],
           },
@@ -89,6 +90,7 @@ void main() {
             forms: [
               Form(
                 Uri.parse("https://example.org"),
+                contentType: "application/cbor",
               ),
             ],
             dataSchema: const DataSchema(