diff --git a/sv/sv0400.cpp b/sv/sv0400.cpp
index 5b863ac58..3bde48ff7 100755
--- a/sv/sv0400.cpp
+++ b/sv/sv0400.cpp
@@ -5,11 +5,12 @@
 
 class TParametri_stat : public TConfig_application
 {
-  bool _recalculated;
+  bool _recalc_needed;
 
 protected:
   virtual const char* get_mask_name() const { return "sv0400a"; }
   virtual bool postprocess_config_changed (const char*, const char*, const char*, const char*);
+  virtual bool user_destroy() ;
 
 public:
   TParametri_stat();
@@ -17,17 +18,26 @@ public:
 
 bool TParametri_stat::postprocess_config_changed (const char*, const char*, const char*, const char*)
 {
-  bool recalc = !_recalculated && yesno_box("Si desidera ricalcolare le statistiche ora?");
-  if (recalc)
-  {
-    TExternal_app app("sv2 -0");
-    _recalculated = app.run() == 0;
-  }
+  _recalc_needed = TRUE;
   return TRUE;
 }         
 
+bool TParametri_stat::user_destroy()
+{
+  const bool ok = TConfig_application::user_destroy();
+  if (ok)
+  {
+    if (_recalc_needed && yesno_box("Si desidera ricalcolare le statistiche ora?"))
+    {
+      TExternal_app app("sv2 -0");
+      app.run();
+    }
+  }
+  return ok; 
+}
+
 TParametri_stat::TParametri_stat() 
-               : TConfig_application(CONFIG_DITTA), _recalculated(FALSE)
+               : TConfig_application(CONFIG_DITTA), _recalc_needed(FALSE)
 { } 
 
 int sv0400(int argc, char* argv[])