diff --git a/src/escpos/printer.py b/src/escpos/printer.py
index 5102890..b9869f6 100644
--- a/src/escpos/printer.py
+++ b/src/escpos/printer.py
@@ -154,7 +154,7 @@ class Serial(Escpos):
         :type msg: bytes
         """
         self.device.write(msg)
-        
+
     def _read(self):
         """ Reads a data buffer and returns it to the caller. """
         return self.device.read(16)