diff --git a/cmdopt.cpp b/cmdopt.cpp
index 5ab3d2d2..ec876652 100644
--- a/cmdopt.cpp
+++ b/cmdopt.cpp
@@ -85,10 +85,17 @@ namespace util { namespace cmdopt { namespace option {
 
 ///////////////////////////////////////////////////////////////////////////////
 template <typename T>
+count<T>::count (std::string _name, T &_data):
+    value<T> (std::move (_name), _data)
+{ ; }
+
+
+//-------------------------------------------------------------------------
+template <typename T>
 void
 count<T>::execute (void)
 {
-    ++ this->data();
+    ++this->data ();
 }
 
 
diff --git a/cmdopt.hpp b/cmdopt.hpp
index 3f17e18c..56e642ce 100644
--- a/cmdopt.hpp
+++ b/cmdopt.hpp
@@ -62,7 +62,7 @@ namespace util { namespace cmdopt {
         template <typename T = unsigned>
         class count : public value<T> {
         public:
-            count (std::string name);
+            count (std::string name, T&);
 
             using value<T>::execute;
             void execute (void) override;