diff --git a/pyro/distributions/torch_distribution.py b/pyro/distributions/torch_distribution.py
index ace02da72a..379dd8f01a 100644
--- a/pyro/distributions/torch_distribution.py
+++ b/pyro/distributions/torch_distribution.py
@@ -3,7 +3,6 @@
 
 import warnings
 from collections import OrderedDict
-from typing import Callable
 
 import torch
 from torch.distributions.kl import kl_divergence, register_kl
@@ -16,7 +15,7 @@
 from .util import broadcast_shape, scale_and_mask
 
 
-class TorchDistributionMixin(Distribution, Callable):
+class TorchDistributionMixin(Distribution):
     """
     Mixin to provide Pyro compatibility for PyTorch distributions.