diff --git a/ipykernel/subshell_manager.py b/ipykernel/subshell_manager.py
index 31e4dd1d..c245816b 100644
--- a/ipykernel/subshell_manager.py
+++ b/ipykernel/subshell_manager.py
@@ -67,7 +67,7 @@ def __init__(
 
     @property
     def _control_shell_channel_socket(self) -> zmq_anyio.Socket:
-        if self.__control_shell_channel_socket  is None:
+        if self.__control_shell_channel_socket is None:
             self.__control_shell_channel_socket = self._create_inproc_pair_socket("control", True)
         return self.__control_shell_channel_socket
 
@@ -75,7 +75,7 @@ def _control_shell_channel_socket(self) -> zmq_anyio.Socket:
     def _control_other_socket(self) -> zmq_anyio.Socket:
         if self.__control_other_socket is None:
             self.__control_other_socket = self._create_inproc_pair_socket("control", False)
-        return self.__control_other_socket 
+        return self.__control_other_socket
 
     @property
     def _parent_shell_channel_socket(self) -> zmq_anyio.Socket: