diff --git a/notificationd/com.cutefish.Notification.xml b/notificationd/com.cutefish.Notification.xml
index 23581fd..66bebe0 100644
--- a/notificationd/com.cutefish.Notification.xml
+++ b/notificationd/com.cutefish.Notification.xml
@@ -5,5 +5,7 @@
     <method name="setDoNotDisturb">
       <arg name="enabled" type="b" direction="in"/>
     </method>
+    <signal name="doNotDisturbChanged">
+    </signal>
   </interface>
 </node>
diff --git a/settings-daemon/application.cpp b/settings-daemon/application.cpp
index 049cb56..50cff54 100644
--- a/settings-daemon/application.cpp
+++ b/settings-daemon/application.cpp
@@ -44,6 +44,7 @@ Application::Application(int &argc, char **argv)
     , m_language(Language::self())
     , m_mouse(new Mouse)
     , m_touchpad(new TouchpadManager)
+    , m_defaultApps(new DefaultApplications)
 //    , m_kwinTimer(new QTimer(this))
 {
     initTrash();
diff --git a/settings-daemon/application.h b/settings-daemon/application.h
index 9459938..939e3f0 100644
--- a/settings-daemon/application.h
+++ b/settings-daemon/application.h
@@ -27,6 +27,7 @@
 #include "language/language.h"
 #include "mouse/mousemanager.h"
 #include "touchpad/touchpadmanager.h"
+#include "defaultapplications.h"
 
 #include <QTimer>
 
@@ -49,6 +50,7 @@ private:
     Language *m_language;
     Mouse *m_mouse;
     TouchpadManager *m_touchpad;
+    DefaultApplications *m_defaultApps;
 
 //    QTimer *m_kwinTimer;
 };
diff --git a/settings-daemon/defaultapplications.cpp b/settings-daemon/defaultapplications.cpp
new file mode 100644
index 0000000..52db3e7
--- /dev/null
+++ b/settings-daemon/defaultapplications.cpp
@@ -0,0 +1,7 @@
+#include "defaultapplications.h"
+
+DefaultApplications::DefaultApplications(QObject *parent)
+    : QObject(parent)
+{
+
+}
diff --git a/settings-daemon/defaultapplications.h b/settings-daemon/defaultapplications.h
new file mode 100644
index 0000000..710ed0f
--- /dev/null
+++ b/settings-daemon/defaultapplications.h
@@ -0,0 +1,14 @@
+#ifndef DEFAULTAPPLICATIONS_H
+#define DEFAULTAPPLICATIONS_H
+
+#include <QObject>
+
+class DefaultApplications : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit DefaultApplications(QObject *parent = nullptr);
+};
+
+#endif // DEFAULTAPPLICATIONS_H