@@ -3,7 +3,7 @@ use crate::common::format::FormatSpec;
 use crate::{
     AsObject, Context, Py, PyObject, PyObjectRef, PyPayload, PyResult, TryFromBorrowedObject,
     VirtualMachine,
-    class::PyClassImpl,
+    class::{PyClassImpl, StaticType},
     convert::{IntoPyException, ToPyObject, ToPyResult},
     function::OptionalArg,
     identifier,
@@ -93,6 +93,10 @@ impl PyPayload for PyBool {
         std::any::TypeId::of::<PyInt>()
     }
 
+    fn downcastable_from(obj: &PyObject) -> bool {
+        obj.class().is(PyBool::static_type())
+    }
+
     fn try_downcast_from(obj: &PyObject, vm: &VirtualMachine) -> PyResult<()> {
         if obj.class().is(vm.ctx.types.bool_type) {
             return Ok(());