diff --git a/src/plugins/qmldesigner/components/navigator/navigatortreeview.cpp b/src/plugins/qmldesigner/components/navigator/navigatortreeview.cpp
index 9ca9a7f6d84235bf55723e753b9035880d7e92ec..a427f1451a0776f8136cd6e90e8afae17151c146 100644
--- a/src/plugins/qmldesigner/components/navigator/navigatortreeview.cpp
+++ b/src/plugins/qmldesigner/components/navigator/navigatortreeview.cpp
@@ -42,6 +42,8 @@ namespace QmlDesigner {
 QSize IconCheckboxItemDelegate::sizeHint(const QStyleOptionViewItem &option,
                                          const QModelIndex &index) const
 {
+    Q_UNUSED(option);
+    Q_UNUSED(index);
     return QSize(15,17);
 }