diff --git a/bumble/pairing.py b/bumble/pairing.py
index f52e35ee..d91993d3 100644
--- a/bumble/pairing.py
+++ b/bumble/pairing.py
@@ -146,7 +146,7 @@ class PairingDelegate:
         io_capability: IoCapability = NO_OUTPUT_NO_INPUT,
         local_initiator_key_distribution: KeyDistribution = DEFAULT_KEY_DISTRIBUTION,
         local_responder_key_distribution: KeyDistribution = DEFAULT_KEY_DISTRIBUTION,
-        maximum_encryption_key_size: int = 16
+        maximum_encryption_key_size: int = 16,
     ) -> None:
         self.io_capability = io_capability
         self.local_initiator_key_distribution = local_initiator_key_distribution