diff --git a/cura/Settings/CuraContainerStack.py b/cura/Settings/CuraContainerStack.py
index d14f2d04c9..fc90e3b239 100755
--- a/cura/Settings/CuraContainerStack.py
+++ b/cura/Settings/CuraContainerStack.py
@@ -5,7 +5,7 @@ import os.path
 
 from typing import Any, Optional
 
-from PyQt5.QtCore import pyqtProperty, pyqtSignal
+from PyQt5.QtCore import pyqtProperty, pyqtSignal, QObject
 from UM.FlameProfiler import pyqtSlot
 
 from UM.Decorators import override
@@ -250,7 +250,7 @@ class CuraContainerStack(ContainerStack):
     ##  Get the definition container.
     #
     #   \return The definition container. Should always be a valid container, but can be equal to the empty InstanceContainer.
-    @pyqtProperty(DefinitionContainer, fset = setDefinition, notify = pyqtContainersChanged)
+    @pyqtProperty(QObject, fset = setDefinition, notify = pyqtContainersChanged)
     def definition(self) -> DefinitionContainer:
         return self._containers[_ContainerIndexes.Definition]
 
diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index dc05e4fa4d..8738b044fb 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -470,16 +470,10 @@ class MachineManager(QObject):
 
         return ""
 
-    @pyqtProperty("QObject", notify = globalContainerChanged)
+    @pyqtProperty(QObject, notify = globalContainerChanged)
     def activeMachine(self) -> "GlobalStack":
         return self._global_container_stack
 
-    @pyqtProperty(str, notify = globalContainerChanged)
-    def activeMachineDefinitionId(self) -> str:
-        if self._global_container_stack and self._global_container_stack.definition:
-            return self._global_container_stack.definition.getId()
-        return ""
-
     @pyqtProperty(str, notify = activeStackChanged)
     def activeStackId(self) -> str:
         if self._active_container_stack:
diff --git a/resources/qml/SidebarHeader.qml b/resources/qml/SidebarHeader.qml
index 9c46062743..32e1db607a 100644
--- a/resources/qml/SidebarHeader.qml
+++ b/resources/qml/SidebarHeader.qml
@@ -221,7 +221,7 @@ Column
             {
                 // open the material URL with web browser
                 var version = UM.Application.version;
-                var machineName = Cura.MachineManager.activeMachineDefinitionId;
+                var machineName = Cura.MachineManager.activeMachine.definition.id;
 
                 var url = "https://ultimaker.com/materialcompatibility/" + version + "/" + machineName;
                 Qt.openUrlExternally(url);