diff --git a/kernel/sy_old/mars_light.c b/kernel/sy_old/mars_light.c
index 5684be3b..a05b7515 100644
--- a/kernel/sy_old/mars_light.c
+++ b/kernel/sy_old/mars_light.c
@@ -2171,6 +2171,7 @@ void _make_alive(void)
 	}
 	_make_alivelink("alive", mars_global && mars_global->global_power.button ? 1 : 0);
 	_make_alivelink_str("tree", SYMLINK_TREE_VERSION);
+	_make_alivelink_str("buildtag", BUILDTAG "(" BUILDDATE ")");
 }
 
 void from_remote_trigger(void)