diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index 19c4faf369..057eb7e144 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -235,6 +235,8 @@ QCocoaWindow::QCocoaWindow(QWindow *tlw)
     setGeometry(tlw->geometry());
     recreateWindow(parent());
     tlw->setGeometry(geometry());
+    if (tlw->isTopLevel())
+        setWindowIcon(tlw->icon());
     m_inConstructor = false;
 }
 
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 9d817c2043..08ff7123eb 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -837,6 +837,8 @@ QWindowsWindow::QWindowsWindow(QWindow *aWindow, const WindowData &data) :
     const qreal opacity = qt_window_private(aWindow)->opacity;
     if (!qFuzzyCompare(opacity, qreal(1.0)))
         setOpacity(opacity);
+    if (aWindow->isTopLevel())
+        setWindowIcon(aWindow->icon());
     clearFlag(WithinCreate);
 }
 
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 6291396e6e..065989735c 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -458,6 +458,8 @@ void QXcbWindow::create()
     const qreal opacity = qt_window_private(window())->opacity;
     if (!qFuzzyCompare(opacity, qreal(1.0)))
         setOpacity(opacity);
+    if (window()->isTopLevel())
+        setWindowIcon(window()->icon());
 }
 
 QXcbWindow::~QXcbWindow()