diff --git a/src/waylandwindow.cpp b/src/waylandwindow.cpp
index 7fdc4e6cce..610e0c7252 100644
--- a/src/waylandwindow.cpp
+++ b/src/waylandwindow.cpp
@@ -291,6 +291,7 @@ void WaylandWindow::markAsMapped()
 {
     if (Q_UNLIKELY(!ready_for_painting)) {
         setupCompositing();
+        updateCaption();
         setReadyForPainting();
     }
 }