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-rw-r--r--src/plugins/platforms/windows/qwindowswindow.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 4aa6eaea4a..f54c100f25 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -1260,6 +1260,11 @@ static inline HWND transientParentHwnd(HWND hwnd)
// really exist on Windows, the relationship is set by passing a parent along with !WS_CHILD
// to window creation or by setting the parent using GWL_HWNDPARENT (as opposed to
// SetParent, which would make it a real child).
+
+#ifndef GWL_HWNDPARENT
+# define GWL_HWNDPARENT (-8)
+#endif
+
void QWindowsWindow::updateTransientParent() const
{
if (window()->type() == Qt::Popup)