diff --git a/ve/ve0300.cpp b/ve/ve0300.cpp
index ca26b21da..9f35350df 100755
--- a/ve/ve0300.cpp
+++ b/ve/ve0300.cpp
@@ -1297,7 +1297,7 @@ void TMask_generator::genera( const TString& profilo )
        found = c->id() == F_DATACAMBIO1;
        
      if (found && c->stato_reale() != S_NASCOSTO)
-       m << format("CO,%d", F_DATACAMBIO1);
+       m << format("|CO,%d", F_DATACAMBIO1);
    }
   _m->message(m);
   _m->flag( "A" );