diff --git a/signal.hpp b/signal.hpp
index 03a25422..2ef09a53 100644
--- a/signal.hpp
+++ b/signal.hpp
@@ -64,6 +64,9 @@ namespace util {
     template <typename T>
     class value_signal : public signal<void(T)> {
     public:
+        value_signal (T&&);
+        value_signal () = default;
+
         operator const T&() const;
 
         value_signal<T>& operator= (const T&);
diff --git a/signal.ipp b/signal.ipp
index 01fa15eb..8629ab74 100644
--- a/signal.ipp
+++ b/signal.ipp
@@ -171,12 +171,20 @@ namespace util {
 
     ///////////////////////////////////////////////////////////////////////////
     template <typename T>
+    value_signal<T>::value_signal (T &&t):
+        m_value (std::forward<T> (t))
+    { ; }
+
+
+    //-------------------------------------------------------------------------
+    template <typename T>
     value_signal<T>::operator const T&() const
     {
         return m_value;
     }
 
 
+    //-------------------------------------------------------------------------
     template <typename T>
     value_signal<T>&
     value_signal<T>::operator= (const T &t)