diff --git a/src/mg/mg1200.cpp b/src/mg/mg1200.cpp
index 21e963b4c..7ebcf54a5 100755
--- a/src/mg/mg1200.cpp
+++ b/src/mg/mg1200.cpp
@@ -10,6 +10,7 @@ class TMask_buildmov: public TMask
   static bool handle_annoes(TMask_field &, KEY); // handler del numero di registrazione
 public:
   TMask_buildmov();
+  virtual ~TMask_buildmov() {}
 };
 
 TMask_buildmov::TMask_buildmov() : TMask("mg1200")