diff --git a/devlib/connection.py b/devlib/connection.py
index aea423b..17325db 100644
--- a/devlib/connection.py
+++ b/devlib/connection.py
@@ -436,7 +436,7 @@ class TransferManagerBase(ABC):
             self.transfer_started.clear()
             self.transfer_completed.clear()
             self.transfer_aborted.clear()
-    
+
     def _monitor(self):
         start_t = monotonic()
         self.transfer_completed.wait(self.start_transfer_poll_delay)
@@ -470,7 +470,7 @@ class PopenTransferManager(TransferManagerBase):
     def set_transfer_and_wait(self, popen_bg_cmd):
         self.transfer = popen_bg_cmd
         ret = self.transfer.wait()
-      
+
         if ret and not self.transfer_aborted.is_set():
             raise subprocess.CalledProcessError(ret, self.transfer.popen.args)
         elif self.transfer_aborted.is_set():
@@ -520,4 +520,4 @@ class SSHTransferManager(TransferManagerBase):
                 self.to_transfer = args[1]
             elif len(args) == 2:  # For SFTPClient callbacks
                 self.transferred = args[0]
-                self.to_transfer = args[1]
\ No newline at end of file
+                self.to_transfer = args[1]