diff --git a/demo.html b/demo.html
index 241285e26..22f364666 100644
--- a/demo.html
+++ b/demo.html
@@ -1323,16 +1323,16 @@
         }
       });
       cmdm.add('set-device-desktop', {
-        run: ed => ed.setDevice('Desktop'),
-        stop() {},
+        run: function(ed) { ed.setDevice('Desktop') },
+        stop: function() {},
       });
       cmdm.add('set-device-tablet', {
-        run: ed => ed.setDevice('Tablet'),
-        stop() {},
+        run: function(ed) { ed.setDevice('Tablet') },
+        stop: function() {},
       });
       cmdm.add('set-device-mobile', {
-        run: ed => ed.setDevice('Mobile portrait'),
-        stop() {},
+        run: function(ed) { ed.setDevice('Mobile portrait') },
+        stop: function() {},
       });