diff --git a/vcr/serializers/jsonserializer.py b/vcr/serializers/jsonserializer.py
index 3378c27..000c894 100644
--- a/vcr/serializers/jsonserializer.py
+++ b/vcr/serializers/jsonserializer.py
@@ -25,5 +25,5 @@ def serialize(cassette_dict):
             original.end,
             original.args[-1] + error_message
         )
-    except TypeError as original:  # py3
+    except TypeError:  # py3
         raise TypeError(error_message)