diff --git a/vm/src/protocol/object.rs b/vm/src/protocol/object.rs
index 28f481fe96..dc7f487e85 100644
--- a/vm/src/protocol/object.rs
+++ b/vm/src/protocol/object.rs
@@ -565,7 +565,7 @@ impl PyObject {
 
     // int PyObject_TypeCheck(PyObject *o, PyTypeObject *type)
     pub fn type_check(&self, typ: PyTypeRef) -> bool {
-        self.class().fast_isinstance(&typ)
+        self.fast_isinstance(&typ)
     }
 
     pub fn length_opt(&self, vm: &VirtualMachine) -> Option<PyResult<usize>> {