diff --git a/tests/manual/diaglib/nativewindowdump_win.cpp b/tests/manual/diaglib/nativewindowdump_win.cpp
index 814b580f4b0..69ba17a5d0f 100644
--- a/tests/manual/diaglib/nativewindowdump_win.cpp
+++ b/tests/manual/diaglib/nativewindowdump_win.cpp
@@ -41,6 +41,10 @@
 
 #include <QtCore/qt_windows.h>
 
+#ifndef WS_EX_NOREDIRECTIONBITMAP
+#  define WS_EX_NOREDIRECTIONBITMAP 0x00200000L
+#endif
+
 namespace QtDiag {
 
 struct DumpContext {