diff --git a/mkspecs/win32-g++/qplatformdefs.h b/mkspecs/win32-g++/qplatformdefs.h
index c5a70b1445e..e9ced3732ad 100644
--- a/mkspecs/win32-g++/qplatformdefs.h
+++ b/mkspecs/win32-g++/qplatformdefs.h
@@ -46,6 +46,8 @@
 #endif
 #endif
 
+#include <unistd.h> // Defines _POSIX_THREAD_SAFE_FUNCTIONS and others
+
 // Get Qt defines/settings
 
 #include "qglobal.h"
diff --git a/src/corelib/time/qdatetime.cpp b/src/corelib/time/qdatetime.cpp
index 7ee38656112..ab3d923ef96 100644
--- a/src/corelib/time/qdatetime.cpp
+++ b/src/corelib/time/qdatetime.cpp
@@ -66,9 +66,6 @@
 #  include <qt_windows.h>
 #endif
 #include <time.h>
-#ifdef Q_CC_MINGW
-#  include <unistd.h> // Define _POSIX_THREAD_SAFE_FUNCTIONS to obtain localtime_r()
-#endif
 
 QT_BEGIN_NAMESPACE