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-rw-r--r--synapse/types.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/types.py b/synapse/types.py
index 6d20ef3641..e6afc05cee 100644
--- a/synapse/types.py
+++ b/synapse/types.py
@@ -243,7 +243,7 @@ def strip_invalid_mxid_characters(localpart):
         localpart (basestring): the localpart having been stripped
     """
     filtered = filter(lambda c: c in mxid_localpart_allowed_characters, localpart)
-    return "".join(list(filtered))
+    return "".join(filtered)
 
 
 UPPER_CASE_PATTERN = re.compile(b"[A-Z_]")