diff --git a/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml b/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml
index 7ff47ea16f..72b640e94a 100644
--- a/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml
+++ b/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml
@@ -181,8 +181,8 @@ Item
                 {
                     id: materialSelection
 
-                    property var valueError: Cura.MachineManager.activeStack != null ? Cura.ContainerManager.getContainerMetaDataEntry(Cura.MachineManager.activeStack.material.id, "compatible", "") != "True" : true
-                    property var valueWarning: !Cura.MachineManager.isActiveQualitySupported
+                    property bool valueError: Cura.MachineManager.activeStack != null ? Cura.ContainerManager.getContainerMetaDataEntry(Cura.MachineManager.activeStack.material.id, "compatible", "") != "True" : true
+                    property bool valueWarning: !Cura.MachineManager.isActiveQualitySupported
 
                     text: Cura.MachineManager.activeStack != null ? Cura.MachineManager.activeStack.material.name : ""
                     tooltip: text
@@ -232,4 +232,4 @@ Item
             }
         }
     }
-}
\ No newline at end of file
+}