diff --git a/vm/src/builtins/enumerate.rs b/vm/src/builtins/enumerate.rs
index 4f34ee7dc..c3be54b06 100644
--- a/vm/src/builtins/enumerate.rs
+++ b/vm/src/builtins/enumerate.rs
@@ -32,7 +32,7 @@ struct EnumerateArgs {
     start: OptionalArg<PyIntRef>,
 }
 
-#[pyimpl(with(PyIter))]
+#[pyimpl(with(PyIter), flags(BASETYPE))]
 impl PyEnumerate {
     #[pyslot]
     fn tp_new(cls: PyTypeRef, args: EnumerateArgs, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {