diff --git a/panels/dock/taskmanager/taskmanager.cpp b/panels/dock/taskmanager/taskmanager.cpp
index 0c64335f5..bff0edf57 100644
--- a/panels/dock/taskmanager/taskmanager.cpp
+++ b/panels/dock/taskmanager/taskmanager.cpp
@@ -247,7 +247,7 @@ bool TaskManager::init()
         modifyOpacityChanged();
         connect(appearanceApplet, SIGNAL(opacityChanged()), this, SLOT(modifyOpacityChanged()));
     }
-    QTimer::singleShot(500, [this]() {
+    QTimer::singleShot(500, this, [this]() {
         if (m_windowMonitor)
             m_windowMonitor->start();
     });