1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/handlers/saml.py b/synapse/handlers/saml.py

index 72f54c9403..e6e71e9729 100644
--- a/synapse/handlers/saml.py
+++ b/synapse/handlers/saml.py
@@ -372,7 +372,7 @@ class SamlHandler(BaseHandler):
 
 
 DOT_REPLACE_PATTERN = re.compile(
-    ("[^%s]" % (re.escape("".join(mxid_localpart_allowed_characters)),))
+    "[^%s]" % (re.escape("".join(mxid_localpart_allowed_characters)),)
 )