diff --git a/klippy/klippy.py b/klippy/klippy.py
index 9692e605..d7b62453 100644
--- a/klippy/klippy.py
+++ b/klippy/klippy.py
@@ -22,15 +22,13 @@ command to reload the config and restart the host software.
 Printer is halted
 """
 
-message_protocol_error1 = "MCU Protocol error"
-
-message_protocol_error2 = """
+message_protocol_error1 = """
 This is frequently caused by running an older version of the
 firmware on the MCU(s). Fix by recompiling and flashing the
 firmware.
 """
 
-message_protocol_error3 = """
+message_protocol_error2 = """
 Once the underlying issue is corrected, use the "RESTART"
 command to reload the config and restart the host software.
 """
@@ -145,46 +143,33 @@ class Printer:
             m.add_printer_objects(config)
         # Validate that there are no undefined parameters in the config file
         pconfig.check_unused_options(config)
-
     def _build_protocol_error_message(self, e):
         host_version = self.start_args['software_version']
-
         msg_update = []
         msg_updated = []
-
-        for n,mcu_obj in self.lookup_objects('mcu'):
+        for mcu_name, mcu in self.lookup_objects('mcu'):
             try:
-                mcu_version = mcu_obj.get_status()['mcu_version']
+                mcu_version = mcu.get_status()['mcu_version']
             except:
-                logging.exception("Unable to retrieve mcu_version from mcu_obj")
+                logging.exception("Unable to retrieve mcu_version from mcu")
                 continue
-
             if mcu_version != host_version:
-                msg_update.append("%s: Current version %s" % (
-                n.split()[-1], mcu_obj.get_status()['mcu_version']))
+                msg_update.append("%s: Current version %s"
+                                  % (mcu_name.split()[-1], mcu_version))
             else:
-                msg_updated.append("%s: Current version %s" % (
-                n.split()[-1], mcu_obj.get_status()['mcu_version']))
-
-        if len(msg_updated) == 0:
+                msg_updated.append("%s: Current version %s"
+                                   % (mcu_name.split()[-1], mcu_version))
+        if not msg_update:
+            msg_update.append("<none>")
+        if not msg_updated:
             msg_updated.append("<none>")
-
-        version_msg = ["\nYour Klipper version is: %s\n" % host_version,
-               "MCU(s) which should be updated:",
-               "\n%s\n" % "\n".join(msg_update),
-               "Up-to-date MCU(s):",
-               "\n%s\n" % "\n".join(msg_updated)]
-
-        msg = [message_protocol_error1,
-               "",
-               ' '.join(message_protocol_error2.splitlines())[1:],
-               "\n".join(version_msg),
-               ' '.join(message_protocol_error3.splitlines())[1:],
-               "",
-               str(e)]
-
+        msg = ["MCU Protocol error",
+               message_protocol_error1,
+               "Your Klipper version is: %s" % (host_version,),
+               "MCU(s) which should be updated:"]
+        msg += msg_update + ["Up-to-date MCU(s):"] + msg_updated
+        msg += [message_protocol_error2, str(e)]
         return "\n".join(msg)
-
     def _connect(self, eventtime):
         try:
             self._read_config()