diff --git a/cura/PrinterOutputDevice.py b/cura/PrinterOutputDevice.py
index b33993f150..3102d73bb0 100644
--- a/cura/PrinterOutputDevice.py
+++ b/cura/PrinterOutputDevice.py
@@ -74,7 +74,7 @@ class PrinterOutputDevice(QObject, OutputDevice):
     # Signal to indicate that the configuration of one of the printers has changed.
     uniqueConfigurationsChanged = pyqtSignal()
 
-    def __init__(self, device_id: str, connection_type: "ConnectionType", parent: QObject = None) -> None:
+    def __init__(self, device_id: str, connection_type: "ConnectionType" = ConnectionType.Unknown, parent: QObject = None) -> None:
         super().__init__(device_id = device_id, parent = parent) # type: ignore  # MyPy complains with the multiple inheritance
 
         self._printers = []  # type: List[PrinterOutputModel]