diff --git a/dust-lang/tests/enums.rs b/dust-lang/tests/enums.rs
index a1f4fdb..db44e53 100644
--- a/dust-lang/tests/enums.rs
+++ b/dust-lang/tests/enums.rs
@@ -40,7 +40,7 @@ fn big_enum() {
         ),
         Ok(Some(Value::enum_instance(
             Identifier::new("FooBarBaz"),
-            None,
+            Some(vec![Type::Integer, Type::String, Type::Float]),
             Identifier::new("Baz"),
             Some(Value::float(42.0)),
         )))