diff --git a/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml b/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml
index e28478e9e2..72b640e94a 100644
--- a/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml
+++ b/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml
@@ -182,7 +182,7 @@ Item
                     id: materialSelection
 
                     property bool valueError: Cura.MachineManager.activeStack != null ? Cura.ContainerManager.getContainerMetaDataEntry(Cura.MachineManager.activeStack.material.id, "compatible", "") != "True" : true
-                    property var valueWarning: !Cura.MachineManager.isActiveQualitySupported
+                    property bool valueWarning: !Cura.MachineManager.isActiveQualitySupported
 
                     text: Cura.MachineManager.activeStack != null ? Cura.MachineManager.activeStack.material.name : ""
                     tooltip: text