diff --git a/flax/nnx/rnglib.py b/flax/nnx/rnglib.py
index 070b2fa77..833fbb9eb 100644
--- a/flax/nnx/rnglib.py
+++ b/flax/nnx/rnglib.py
@@ -433,6 +433,8 @@ def __getitem__(self, name: str):
     return self._get_stream(name, KeyError)
 
   def __getattr__(self, name: str):
+    if name.startswith('__') and name.endswith('__'):
+      raise AttributeError(name)
     return self._get_stream(name, AttributeError)
 
   def __call__(self):
diff --git a/tests/nnx/rngs_test.py b/tests/nnx/rngs_test.py
index 1652b6231..6f680796f 100644
--- a/tests/nnx/rngs_test.py
+++ b/tests/nnx/rngs_test.py
@@ -421,5 +421,15 @@ def test_with_rngs_broadcast(self, graph):
     self.assertEqual(new_rngs_mapped['dropout'].key.shape, ())
 
 
+  def test_dunder_raises_attribute_error(self):
+    rngs = nnx.Rngs(default=42)
+    with self.assertRaises(AttributeError):
+      _ = rngs.__pydantic_serializer__
+    with self.assertRaises(AttributeError):
+      _ = rngs.__totally_fake__
+    with self.assertRaises(AttributeError):
+      _ = rngs.__json__
+
+
 if __name__ == '__main__':
   absltest.main()