1 files changed, 3 insertions, 2 deletions
diff --git a/synapse/config/tls.py b/synapse/config/tls.py
index 4ca111618f..6e673d65a7 100644
--- a/synapse/config/tls.py
+++ b/synapse/config/tls.py
@@ -16,11 +16,12 @@ import logging
 import os
 from typing import List, Optional, Pattern
 
+from matrix_common.regex import glob_to_regex
+
 from OpenSSL import SSL, crypto
 from twisted.internet._sslverify import Certificate, trustRootFromCertificates
 
 from synapse.config._base import Config, ConfigError
-from synapse.util import glob_to_regex
 
 logger = logging.getLogger(__name__)
 
@@ -132,7 +133,7 @@ class TlsConfig(Config):
         self.tls_certificate: Optional[crypto.X509] = None
         self.tls_private_key: Optional[crypto.PKey] = None
 
-    def read_certificate_from_disk(self):
+    def read_certificate_from_disk(self) -> None:
         """
         Read the certificates and private key from disk.
         """