diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h
index 128d8abad7..c84a6b5577 100644
--- a/src/corelib/global/qglobal.h
+++ b/src/corelib/global/qglobal.h
@@ -1046,8 +1046,17 @@ template <typename T> struct QEnableIf<true, T> { typedef T Type; };
 
 template <bool B, typename T, typename F> struct QConditional { typedef T Type; };
 template <typename T, typename F> struct QConditional<false, T, F> { typedef F Type; };
+
+template <typename T> struct QAddConst { typedef const T Type; };
 }
 
+// this adds const to non-const objects (like std::as_const)
+template <typename T>
+Q_DECL_CONSTEXPR typename QtPrivate::QAddConst<T>::Type &qAsConst(T &t) Q_DECL_NOTHROW { return t; }
+// prevent rvalue arguments:
+template <typename T>
+void qAsConst(const T &&) Q_DECL_EQ_DELETE;
+
 QT_END_NAMESPACE
 
 // We need to keep QTypeInfo, QSysInfo, QFlags, qDebug & family in qglobal.h for compatibility with Qt 4.