--- a/src/corelib/concurrent/qfuture.h	Mon Mar 15 12:43:09 2010 +0200
+++ b/src/corelib/concurrent/qfuture.h	Thu Apr 08 14:19:33 2010 +0300
@@ -111,7 +111,7 @@
     {
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;