diff --git a/moto/iot/exceptions.py b/moto/iot/exceptions.py
index 47435eeb5..7bbdb706d 100644
--- a/moto/iot/exceptions.py
+++ b/moto/iot/exceptions.py
@@ -28,5 +28,6 @@ class VersionConflictException(IoTClientError):
     def __init__(self, name):
         self.code = 409
         super(VersionConflictException, self).__init__(
+            'VersionConflictException',
             'The version for thing %s does not match the expected version.' % name
         )