diff --git a/autotests/ksldtest.cpp b/autotests/ksldtest.cpp
--- a/autotests/ksldtest.cpp
+++ b/autotests/ksldtest.cpp
@@ -150,9 +150,6 @@
     QVERIFY(unlockedSpy.isValid());
 
     // let's wait quite some time to give the greeter a chance to come up
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
-    QEXPECT_FAIL("", "Qt::QueuedConnection broken in Qt 5.6", Abort);
-#endif
     QVERIFY(lockedSpy.wait(30000));
     QCOMPARE(ksld.lockState(), ScreenLocker::KSldApp::Locked);
 
diff --git a/ksldapp.cpp b/ksldapp.cpp
--- a/ksldapp.cpp
+++ b/ksldapp.cpp
@@ -607,15 +607,19 @@
             return;
         }
         m_lockWindow->setGlobalAccel(m_globalAccel);
-        connect(m_lockWindow, &AbstractLocker::userActivity, this,
+        connect(m_lockWindow, &AbstractLocker::userActivity, m_lockWindow,
             [this]() {
                 if (isGraceTime()) {
                     unlock();
                 }
             },
             Qt::QueuedConnection
         );
-        connect(m_lockWindow, &AbstractLocker::lockWindowShown, this, &KSldApp::lockScreenShown, Qt::QueuedConnection);
+        connect(m_lockWindow, &AbstractLocker::lockWindowShown, m_lockWindow,
+            [this] {
+                lockScreenShown();
+            }
+        , Qt::QueuedConnection);
         connect(m_waylandServer, &WaylandServer::x11WindowAdded, m_lockWindow, &AbstractLocker::addAllowedWindow);
     }
     m_lockWindow->showLockWindow();