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-rw-r--r--synapse/events/__init__.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/events/__init__.py b/synapse/events/__init__.py
index 84c75495d5..310075c2b1 100644
--- a/synapse/events/__init__.py
+++ b/synapse/events/__init__.py
@@ -18,6 +18,9 @@ from distutils.util import strtobool
 
 import six
 
+from synapse.api.constants import (
+    EventFormatVersions,
+)
 from synapse.util.caches import intern_dict
 from synapse.util.frozenutils import freeze
 
@@ -179,6 +182,8 @@ class EventBase(object):
 
 
 class FrozenEvent(EventBase):
+    format_version = EventFormatVersions.V1  # All events of this type are V1
+
     def __init__(self, event_dict, internal_metadata_dict={}, rejected_reason=None):
         event_dict = dict(event_dict)