diff --git a/Lib/test/test_weakref.py b/Lib/test/test_weakref.py
index 2e8e679c8..224130110 100644
--- a/Lib/test/test_weakref.py
+++ b/Lib/test/test_weakref.py
@@ -380,7 +380,6 @@ class ReferencesTestCase(TestBase):
     # was not honored, and was broken in different ways for
     # PyWeakref_NewRef() and PyWeakref_NewProxy().  (Two tests.)
 
-    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_shared_ref_without_callback(self):
         self.check_shared_without_callback(weakref.ref)
 
diff --git a/crates/vm/src/builtins/weakref.rs b/crates/vm/src/builtins/weakref.rs
index 11e216847..9e88ffaa2 100644
--- a/crates/vm/src/builtins/weakref.rs
+++ b/crates/vm/src/builtins/weakref.rs
@@ -49,7 +49,7 @@ impl Constructor for PyWeak {
         let referent = positional
             .next()
             .ok_or_else(|| vm.new_type_error("__new__ expected at least 1 argument, got 0"))?;
-        let callback = positional.next();
+        let callback = positional.next().filter(|callback| !vm.is_none(callback));
         if let Some(_extra) = positional.next() {
             let got = positional.count() + 3;
             return Err(