Fixed syntax for python 2.6

1 files changed, 1 insertions, 1 deletions

diff --git a/jwt/api_jws.py b/jwt/api_jws.py
index 557812e..dcb2647 100644
--- a/jwt/api_jws.py
+++ b/jwt/api_jws.py
@@ -139,7 +139,7 @@ class PyJWS(object):
             signing_input, crypto_segment = jwt.rsplit(b'.', 1)
             header_segment, payload_segment = signing_input.split(b'.', 1)
         except AttributeError:
-            raise DecodeError('Invalid payload type. It should be a {} not {}'.format(
+            raise DecodeError('Invalid payload type. It should be a {0} not {1}'.format(
                 text_type, type(jwt)))
         except ValueError:
             raise DecodeError('Not enough segments')