diff --git a/src/corelib/tools/qiterator.h b/src/corelib/tools/qiterator.h
index 25a6f59383..38f9e95d06 100644
--- a/src/corelib/tools/qiterator.h
+++ b/src/corelib/tools/qiterator.h
@@ -46,14 +46,8 @@
 
 QT_BEGIN_HEADER
 
-namespace std {
-    struct bidirectional_iterator_tag;
-    struct random_access_iterator_tag;
-}
-
 QT_BEGIN_NAMESPACE
 
-
 #define Q_DECLARE_SEQUENTIAL_ITERATOR(C) \
 \
 template <class T> \