diff --git a/dataengines/calendar/calendarengine.cpp b/dataengines/calendar/calendarengine.cpp
--- a/dataengines/calendar/calendarengine.cpp
+++ b/dataengines/calendar/calendarengine.cpp
@@ -37,9 +37,8 @@
 #endif
 
 CalendarEngine::CalendarEngine(QObject* parent, const QVariantList& args)
-              : Plasma::DataEngine(parent)
+              : Plasma::DataEngine(parent, args)
 {
-    Q_UNUSED(args);
 }
 
 CalendarEngine::~CalendarEngine()
diff --git a/dataengines/mpris2/mpris2engine.cpp b/dataengines/mpris2/mpris2engine.cpp
--- a/dataengines/mpris2/mpris2engine.cpp
+++ b/dataengines/mpris2/mpris2engine.cpp
@@ -32,9 +32,8 @@
 
 Mpris2Engine::Mpris2Engine(QObject* parent,
                                    const QVariantList& args)
-    : Plasma::DataEngine(parent)
+    : Plasma::DataEngine(parent, args)
 {
-    Q_UNUSED(args)
 
     connect(QDBusConnection::sessionBus().interface(), &QDBusConnectionInterface::serviceOwnerChanged,
             this,           &Mpris2Engine::serviceOwnerChanged);