diff --git a/kippo/core/auth.py b/kippo/core/auth.py
index df3a741b..7173b631 100644
--- a/kippo/core/auth.py
+++ b/kippo/core/auth.py
@@ -124,7 +124,7 @@ class HoneypotPublicKeyChecker:
 
     def requestAvatarId(self, credentials):
         _pubKey = keys.Key.fromString(credentials.blob)
-        log.msg(format='public key attempt for user %(username)s with fingerprint %(fingerprint)%s',
+        log.msg(format='public key attempt for user %(username)s with fingerprint %(fingerprint)s',
             username=credentials.username, fingerprint=_pubKey.fingerprint())
         return failure.Failure(error.ConchError("Incorrect signature"))