diff --git a/cura/MachineActionManager.py b/cura/MachineActionManager.py
index b50bb95e7f..6061a2e49b 100644
--- a/cura/MachineActionManager.py
+++ b/cura/MachineActionManager.py
@@ -57,9 +57,10 @@ class MachineActionManager(QObject):
     def addRequiredAction(self, definition_id, action_key):
         if action_key in self._machine_actions:
             if definition_id in self._required_actions:
-                self._required_actions[definition_id] |= {self._machine_actions[action_key]}
+                if self._machine_actions[action_key] not in self._required_actions[definition_id]:
+                    self._required_actions[definition_id].append(self._machine_actions[action_key])
             else:
-                self._required_actions[definition_id] = {self._machine_actions[action_key]}
+                self._required_actions[definition_id] = [self._machine_actions[action_key]]
         else:
             raise UnknownMachineActionError("Action %s, which is required for %s is not known." % (action_key, definition_id))
 
@@ -67,9 +68,10 @@ class MachineActionManager(QObject):
     def addSupportedAction(self, definition_id, action_key):
         if action_key in self._machine_actions:
             if definition_id in self._supported_actions:
-                self._supported_actions[definition_id] |= {self._machine_actions[action_key]}
+                if self._machine_actions[action_key] not in self._supported_actions[definition_id]:
+                    self._supported_actions[definition_id].append(self._machine_actions[action_key])
             else:
-                self._supported_actions[definition_id] = {self._machine_actions[action_key]}
+                self._supported_actions[definition_id] = [self._machine_actions[action_key]]
         else:
             Logger.log("w", "Unable to add %s to %s, as the action is not recognised", action_key, definition_id)
 
diff --git a/resources/definitions/ultimaker_original.def.json b/resources/definitions/ultimaker_original.def.json
index d2174ece80..0815aeee02 100644
--- a/resources/definitions/ultimaker_original.def.json
+++ b/resources/definitions/ultimaker_original.def.json
@@ -15,7 +15,7 @@
         "preferred_material": "*pla*",
         "preferred_quality": "*normal*",
         "first_start_actions": ["UMOUpgradeSelection", "UMOCheckup", "BedLevel"],
-        "supported_actions": ["UMOCheckup", "UpgradeFirmware", "BedLevel", "UMOUpgradeSelection"]
+        "supported_actions": ["UMOUpgradeSelection", "UMOCheckup", "BedLevel", "UpgradeFirmware"]
     },
 
     "overrides": {