diff --git a/lib/compiler/passes/generate-js.js b/lib/compiler/passes/generate-js.js
index 96efd01..5dfbb31 100644
--- a/lib/compiler/passes/generate-js.js
+++ b/lib/compiler/passes/generate-js.js
@@ -1140,10 +1140,8 @@ function generateJS(ast, options) {
   }
 
   function generateWrapper(toplevelCode) {
-    function generateIntro() {
+    function generateGeneratedByComment() {
       return [
-        '"use strict";',
-        '',
         '/*',
         ' * Generated by PEG.js 0.9.0.',
         ' *',
@@ -1172,8 +1170,9 @@ function generateJS(ast, options) {
     var generators = {
       bare: function() {
         return [
+          generateGeneratedByComment(),
           '(function() {',
-             indent2(generateIntro()),
+          '  "use strict";',
           '',
              indent2(toplevelCode),
           '',
@@ -1199,6 +1198,7 @@ function generateJS(ast, options) {
             params         = dependencyVars.join(', ');
 
         parts.push([
+          generateGeneratedByComment(),
           '(function(root, factory) {',
           '  if (typeof define === "function" && define.amd) {',
           '    define(' + dependencies + ', factory);',
@@ -1216,7 +1216,7 @@ function generateJS(ast, options) {
         parts.push([
           '  }',
           '})(this, function(' + params + ') {',
-             indent2(generateIntro()),
+          '  "use strict";',
           '',
              indent2(toplevelCode),
           '',
diff --git a/lib/parser.js b/lib/parser.js
index ae56fa3..7486f5b 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -1,6 +1,11 @@
 /* eslint-env node, amd */
 /* eslint no-unused-vars: 0 */
 
+/*
+ * Generated by PEG.js 0.9.0.
+ *
+ * http://pegjs.org/
+ */
 (function(root, factory) {
   if (typeof define === "function" && define.amd) {
     define([], factory);
@@ -10,12 +15,6 @@
 })(this, function() {
   "use strict";
 
-  /*
-   * Generated by PEG.js 0.9.0.
-   *
-   * http://pegjs.org/
-   */
-
   function peg$subclass(child, parent) {
     function ctor() { this.constructor = child; }
     ctor.prototype = parent.prototype;