diff --git a/src/gui/platform/unix/qgenericunixthemes.cpp b/src/gui/platform/unix/qgenericunixthemes.cpp
index af2307fd09..6cd2c1b2d4 100644
--- a/src/gui/platform/unix/qgenericunixthemes.cpp
+++ b/src/gui/platform/unix/qgenericunixthemes.cpp
@@ -621,7 +621,7 @@ bool QKdeThemePrivate::initDbus()
         settingChangedHandler(provider, setting, value);
     };
 
-    return QObject::connect(dbus.get(), &QGenericUnixThemeDBusListener::settingChanged, wrapper);
+    return QObject::connect(dbus.get(), &QGenericUnixThemeDBusListener::settingChanged, dbus.get(), wrapper);
 }
 #endif // QT_NO_DBUS
 
@@ -1154,7 +1154,7 @@ bool QGnomeThemePrivate::initDbus()
             updateColorScheme(value);
     };
 
-    return QObject::connect(dbus.get(), &QGenericUnixThemeDBusListener::settingChanged, wrapper);
+    return QObject::connect(dbus.get(), &QGenericUnixThemeDBusListener::settingChanged, dbus.get(), wrapper);
 }
 
 void QGnomeThemePrivate::updateColorScheme(const QString &themeName)
diff --git a/src/platformsupport/input/evdevmouse/qevdevmousemanager.cpp b/src/platformsupport/input/evdevmouse/qevdevmousemanager.cpp
index 112fc62209..55b127ef17 100644
--- a/src/platformsupport/input/evdevmouse/qevdevmousemanager.cpp
+++ b/src/platformsupport/input/evdevmouse/qevdevmousemanager.cpp
@@ -62,7 +62,7 @@ QEvdevMouseManager::QEvdevMouseManager(const QString &key, const QString &specif
     }
 
     QInputDeviceManager *manager = QGuiApplicationPrivate::inputDeviceManager();
-    connect(manager, &QInputDeviceManager::cursorPositionChangeRequested, [this](const QPoint &pos) {
+    connect(manager, &QInputDeviceManager::cursorPositionChangeRequested, this, [this](const QPoint &pos) {
         m_x = pos.x();
         m_y = pos.y();
         clampPosition();
diff --git a/src/platformsupport/input/libinput/qlibinputhandler.cpp b/src/platformsupport/input/libinput/qlibinputhandler.cpp
index 3b49438d0a..ef45533f1a 100644
--- a/src/platformsupport/input/libinput/qlibinputhandler.cpp
+++ b/src/platformsupport/input/libinput/qlibinputhandler.cpp
@@ -79,7 +79,7 @@ QLibInputHandler::QLibInputHandler(const QString &key, const QString &spec)
     m_touch.reset(new QLibInputTouch);
 
     QInputDeviceManager *manager = QGuiApplicationPrivate::inputDeviceManager();
-    connect(manager, &QInputDeviceManager::cursorPositionChangeRequested, [this](const QPoint &pos) {
+    connect(manager, &QInputDeviceManager::cursorPositionChangeRequested, this, [this](const QPoint &pos) {
         m_pointer->setPos(pos);
     });
 
diff --git a/src/plugins/platforms/xcb/qxcbconnection.cpp b/src/plugins/platforms/xcb/qxcbconnection.cpp
index 2e103b0eb2..018c28a02e 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection.cpp
@@ -92,7 +92,7 @@ QXcbConnection::QXcbConnection(QXcbNativeInterface *nativeInterface, bool canGra
     const int focusInDelay = 100;
     m_focusInTimer.setSingleShot(true);
     m_focusInTimer.setInterval(focusInDelay);
-    m_focusInTimer.callOnTimeout([]() {
+    m_focusInTimer.callOnTimeout(this, []() {
         // No FocusIn events for us, proceed with FocusOut normally.
         QWindowSystemInterface::handleWindowActivated(nullptr, Qt::ActiveWindowFocusReason);
     });
diff --git a/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp b/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp
index a31c8b6105..7e2a9daacb 100644
--- a/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp
+++ b/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp
@@ -104,7 +104,7 @@ QXdgDesktopPortalTheme::QXdgDesktopPortalTheme()
     message << "org.freedesktop.portal.FileChooser"_L1 << "version"_L1;
     QDBusPendingCall pendingCall = QDBusConnection::sessionBus().asyncCall(message);
     QDBusPendingCallWatcher *watcher = new QDBusPendingCallWatcher(pendingCall);
-    QObject::connect(watcher, &QDBusPendingCallWatcher::finished, [d] (QDBusPendingCallWatcher *watcher) {
+    QObject::connect(watcher, &QDBusPendingCallWatcher::finished, watcher, [d] (QDBusPendingCallWatcher *watcher) {
         QDBusPendingReply<QVariant> reply = *watcher;
         if (reply.isValid()) {
             d->fileChooserPortalVersion = reply.value().toUInt();