diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 6c6544aeab..68e4c3d8fc 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -2152,6 +2152,7 @@ QWindowsWindowData QWindowsWindow::setWindowFlags_sys(Qt::WindowFlags wt,
     QWindowsWindowData result = m_data;
     result.flags = creationData.flags;
     result.embedded = creationData.embedded;
+    result.hasFrame = (creationData.style & (WS_DLGFRAME | WS_THICKFRAME));
     return result;
 }