diff --git a/src/widgets/util/qcompleter.cpp b/src/widgets/util/qcompleter.cpp
index ef7207a8..5d841965 100644
--- a/src/widgets/util/qcompleter.cpp
+++ b/src/widgets/util/qcompleter.cpp
@@ -981,6 +981,16 @@ void QCompleterPrivate::showPopup(const QRect& rect)
 
     if (!popup->isVisible())
         popup->show();
+#ifndef NO_FOR_WAYLAND
+    QWindow *win = widget->windowHandle();
+    if (!win) {
+        QWidget *parentWidget = widget->nativeParentWidget();
+        if (parentWidget)
+            win = parentWidget->windowHandle();
+    }
+    if (win)
+        popup->windowHandle()->setTransientParent(win);
+#endif
 }
 
 #if QT_CONFIG(filesystemmodel)