diff --git a/src/client/plasmawindowmodel.cpp b/src/client/plasmawindowmodel.cpp
--- a/src/client/plasmawindowmodel.cpp
+++ b/src/client/plasmawindowmodel.cpp
@@ -81,6 +81,10 @@
         [window, this] { this->dataChanged(window, PlasmaWindowModel::AppId); }
     );
 
+    QObject::connect(window, &PlasmaWindow::pidChanged, q,
+        [window, this] { this->dataChanged(window, PlasmaWindowModel::Pid); }
+    );
+
     QObject::connect(window, &PlasmaWindow::activeChanged, q,
         [window, this] { this->dataChanged(window, IsActive); }
     );