diff --git a/dora-frontend/src/typeck/tests.rs b/dora-frontend/src/typeck/tests.rs
index db4d4a0d2..f5e8c7583 100644
--- a/dora-frontend/src/typeck/tests.rs
+++ b/dora-frontend/src/typeck/tests.rs
@@ -4793,6 +4793,31 @@ fn unnamed_class_field() {
     );
 }
 
+#[test]
+fn unnamed_access_on_named_field() {
+    err(
+        "
+        class Foo { a: Int, b: Bool }
+        fn f(x: Foo): Int {
+            x.0
+        }
+    ",
+        (4, 15),
+        ErrorMessage::UnknownField("0".into(), "Foo".into()),
+    );
+
+    err(
+        "
+        struct Foo { a: Int, b: Bool }
+        fn f(x: Foo): Int {
+            x.0
+        }
+    ",
+        (4, 15),
+        ErrorMessage::UnknownField("0".into(), "Foo".into()),
+    );
+}
+
 #[test]
 fn unnamed_struct_field() {
     ok("