diff --git a/mobile_to_maritime/mobile_to_maritime/mobile_to_maritime.py b/mobile_to_maritime/mobile_to_maritime/mobile_to_maritime.py
index 413471d..497d7ed 100644
--- a/mobile_to_maritime/mobile_to_maritime/mobile_to_maritime.py
+++ b/mobile_to_maritime/mobile_to_maritime/mobile_to_maritime.py
@@ -84,7 +84,8 @@ def _get_qos_profile_from_params(self) -> QoSProfile:
         )
 
     @abstractmethod
-    def in_callback(self, msg: Any) -> None: ...
+    def in_callback(self, msg: Any) -> None:
+        ...
 
 
 class MaritimeStampedToMobileStamped(MobileToMaritime):