diff --git a/src/include/mask.cpp b/src/include/mask.cpp
index 344c7f578..90a262aa2 100755
--- a/src/include/mask.cpp
+++ b/src/include/mask.cpp
@@ -72,10 +72,15 @@ void TMask::init_mask()
   _msg_key = 0;
   _test_fld = -1;
   _last_test = -1;
-  _workfile = configdir();
-  _workfile.add(source_file());
-  _workfile.ext("sav");
 
+  const TString mask_name = source_file().name();
+
+  if (mask_name.full())
+  {
+    _workfile = configdir();
+    _workfile.add(source_file().name());
+    _workfile.ext("sav");
+  }
   _toolwin = _toolbar = _notebook = _single = NULL_WIN;
   memset(_pagewin, 0, sizeof(_pagewin)); // Azzero lista pagine
 }