diff --git a/src/librssguard/miscellaneous/application.h b/src/librssguard/miscellaneous/application.h
index 3e0994a2a..dffe53254 100644
--- a/src/librssguard/miscellaneous/application.h
+++ b/src/librssguard/miscellaneous/application.h
@@ -60,6 +60,8 @@ struct GuiMessage {
     QSystemTrayIcon::MessageIcon m_type;
 };
 
+Q_DECLARE_METATYPE(GuiMessage)
+
 struct GuiMessageDestination {
   public:
     GuiMessageDestination(bool tray = true, bool message_box = false, bool status_bar = false)
@@ -70,6 +72,8 @@ struct GuiMessageDestination {
     bool m_statusBar;
 };
 
+Q_DECLARE_METATYPE(GuiMessageDestination)
+
 struct GuiAction {
   public:
     GuiAction(QString title = {}, const std::function<void()>& action = nullptr)
@@ -79,6 +83,8 @@ struct GuiAction {
     std::function<void()> m_action;
 };
 
+Q_DECLARE_METATYPE(GuiAction)
+
 class RSSGUARD_DLLSPEC Application : public SingleApplication {
     Q_OBJECT
 
diff --git a/src/librssguard/miscellaneous/notification.h b/src/librssguard/miscellaneous/notification.h
index 443fe8da7..b9c1a9db6 100644
--- a/src/librssguard/miscellaneous/notification.h
+++ b/src/librssguard/miscellaneous/notification.h
@@ -75,4 +75,6 @@ class Notification {
     qreal m_volume;
 };
 
+Q_DECLARE_METATYPE(Notification::Event)
+
 #endif // NOTIFICATION_H