diff --git a/synapse/config/key.py b/synapse/config/key.py
index dce4b19a2..499ffd4e0 100644
--- a/synapse/config/key.py
+++ b/synapse/config/key.py
@@ -56,7 +56,7 @@ class KeyConfig(Config):
         if not self.macaroon_secret_key:
             # Unfortunately, there are people out there that don't have this
             # set. Lets just be "nice" and derive one from their secret key.
-            logger.warn("Config is missing missing macaroon_secret_key")
+            logger.warn("Config is missing macaroon_secret_key")
             seed = bytes(self.signing_key[0])
             self.macaroon_secret_key = hashlib.sha256(seed).digest()