diff --git a/DiscoverUM3Action.py b/DiscoverUM3Action.py
index b492b79d8b..4415b5f20a 100644
--- a/DiscoverUM3Action.py
+++ b/DiscoverUM3Action.py
@@ -36,9 +36,9 @@ class DiscoverUM3Action(MachineAction):
         global_container_stack = Application.getInstance().getGlobalContainerStack()
         if global_container_stack:
             if "key" in global_container_stack.getMetaData():
-                global_container_stack.setMetaDataEntry("key", key)
+                global_container_stack.setMetaDataEntry("um_network_key", key)
             else:
-                global_container_stack.addMetaDataEntry("key", key)
+                global_container_stack.addMetaDataEntry("um_network_key", key)
 
         if self._network_plugin:
             # Ensure that the connection states are refreshed.
diff --git a/NetworkPrinterOutputDevicePlugin.py b/NetworkPrinterOutputDevicePlugin.py
index ad41d984ae..cee9e5654c 100644
--- a/NetworkPrinterOutputDevicePlugin.py
+++ b/NetworkPrinterOutputDevicePlugin.py
@@ -40,7 +40,7 @@ class NetworkPrinterOutputDevicePlugin(OutputDevicePlugin):
             return
 
         for key in self._printers:
-            if key == active_machine.getMetaDataEntry("key"):
+            if key == active_machine.getMetaDataEntry("um_network_key"):
                 self._printers[key].connect()
                 self._printers[key].connectionStateChanged.connect(self._onPrinterConnectionStateChanged)
             else:
@@ -51,7 +51,7 @@ class NetworkPrinterOutputDevicePlugin(OutputDevicePlugin):
         printer = NetworkPrinterOutputDevice.NetworkPrinterOutputDevice(name, address, properties)
         self._printers[printer.getKey()] = printer
         global_container_stack = Application.getInstance().getGlobalContainerStack()
-        if global_container_stack and printer.getKey() == global_container_stack.getMetaDataEntry("key"):
+        if global_container_stack and printer.getKey() == global_container_stack.getMetaDataEntry("um_network_key"):
             self._printers[printer.getKey()].connect()
             printer.connectionStateChanged.connect(self._onPrinterConnectionStateChanged)