diff --git a/src/corelib/io/qfilesystemiterator_win.cpp b/src/corelib/io/qfilesystemiterator_win.cpp
index 095a46ae493..96c7fdbfda7 100644
--- a/src/corelib/io/qfilesystemiterator_win.cpp
+++ b/src/corelib/io/qfilesystemiterator_win.cpp
@@ -43,6 +43,10 @@
 #include "qfilesystemengine_p.h"
 #include "qplatformdefs.h"
 
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT 0x0500
+#endif
+
 #include <QtCore/qt_windows.h>
 
 QT_BEGIN_NAMESPACE
diff --git a/src/corelib/io/qfilesystemmetadata_p.h b/src/corelib/io/qfilesystemmetadata_p.h
index 50c1b61c477..03bb7f65eb0 100644
--- a/src/corelib/io/qfilesystemmetadata_p.h
+++ b/src/corelib/io/qfilesystemmetadata_p.h
@@ -60,6 +60,10 @@
 
 // Platform-specific includes
 #if defined(Q_OS_WIN)
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT 0x0500
+#endif
+
 #include <QtCore/qt_windows.h>
 #elif defined(Q_OS_SYMBIAN)
 #include <f32file.h>