diff --git a/synapse/events/__init__.py b/synapse/events/__init__.py
index 6030c5887a..4252e5ab5c 100644
--- a/synapse/events/__init__.py
+++ b/synapse/events/__init__.py
@@ -15,8 +15,6 @@
 
 from synapse.util.frozenutils import freeze, unfreeze
 
-import copy
-
 
 class _EventInternalMetadata(object):
     def __init__(self, internal_metadata_dict):