diff --git a/image/private/kernel.js b/image/private/kernel.js
index d24b96a..1630b38 100644
--- a/image/private/kernel.js
+++ b/image/private/kernel.js
@@ -391,7 +391,7 @@ var VideoImage = function(src, rawVideo) {
 VideoImage.prototype = heir(BaseImage.prototype);
 
 
-videos = {};
+var videos = {};
 VideoImage.makeInstance = function(path, rawVideo) {
     if (! (path in VideoImage)) {
 	videos[path] = new VideoImage(path, rawVideo);
diff --git a/js-assembler/package.rkt b/js-assembler/package.rkt
index 49afab1..c544001 100644
--- a/js-assembler/package.rkt
+++ b/js-assembler/package.rkt
@@ -333,7 +333,7 @@ MACHINE.modules[~s] =
     <title>Example</title>
   </head>
   <script>
-
+"use strict";
 EOF
 )