diff --git a/vm/src/frame.rs b/vm/src/frame.rs
index 24a2885ee..bad945dde 100644
--- a/vm/src/frame.rs
+++ b/vm/src/frame.rs
@@ -1783,7 +1783,7 @@ impl ExecutingFrame<'_> {
             bytecode::ComparisonOperator::In => vm.ctx.new_bool(self._in(vm, a, b)?).into(),
             bytecode::ComparisonOperator::NotIn => vm.ctx.new_bool(self._not_in(vm, a, b)?).into(),
             bytecode::ComparisonOperator::ExceptionMatch => {
-                vm.ctx.new_bool(vm.isinstance(&a, &b)?).into()
+                vm.ctx.new_bool(a.is_instance(&b, vm)?).into()
             }
         };
 
diff --git a/vm/src/stdlib/builtins.rs b/vm/src/stdlib/builtins.rs
index 763f272d1..aea245b91 100644
--- a/vm/src/stdlib/builtins.rs
+++ b/vm/src/stdlib/builtins.rs
@@ -397,7 +397,7 @@ mod builtins {
 
     #[pyfunction]
     fn isinstance(obj: PyObjectRef, typ: PyObjectRef, vm: &VirtualMachine) -> PyResult<bool> {
-        vm.isinstance(&obj, &typ)
+        obj.is_instance(&typ, vm)
     }
 
     #[pyfunction]