diff --git a/a8/xparams.h b/a8/xparams.h
index 98e6c64..088f31e 100644
--- a/a8/xparams.h
+++ b/a8/xparams.h
@@ -41,6 +41,7 @@ namespace a8
         a8::XValue param1;
         a8::XValue param2;
         a8::XValue param3;
+        long long _sys_field = 0;
     };
 
 }