diff --git a/js/kiri-driver-fdm.js b/js/kiri-driver-fdm.js
index 71d79f0e..230c5145 100644
--- a/js/kiri-driver-fdm.js
+++ b/js/kiri-driver-fdm.js
@@ -468,8 +468,8 @@ var gs_kiri_fdm = exports;
             append("; " + pk + " = " + process[pk]);
         }
         append("; --- startup ---");
-        let t0 = false;
-        let t1 = false;
+        var t0 = false;
+        var t1 = false;
         for (var i=0; i<device.gcodePre.length; i++) {
             var line = device.gcodePre[i];
             if (line.indexOf('T0') >= 0) t0 = true;
diff --git a/js/license.js b/js/license.js
index f6e8461f..3b5cd6b4 100644
--- a/js/license.js
+++ b/js/license.js
@@ -1,7 +1,7 @@
 var exports = {
     COPYRIGHT:"Copyright (C) 2014-2019 Stewart Allen <sa@grid.space> - All Rights Reserved",
     LICENSE:"See the license.md file included with the source distribution",
-    VERSION:"1.2.6e"
+    VERSION:"1.2.6f"
 };
 if (!module) var module = {};
 module.exports = exports;