diff --git a/.jshintrc b/.jshintrc
index d9bd925..0fdd54e 100644
--- a/.jshintrc
+++ b/.jshintrc
@@ -1,16 +1,18 @@
 {
-  "curly":    true,
-  "eqeqeq":   true,
-  "evil":     true,
-  "forin":    true,
-  "freeze":   true,
-  "immed":    true,
-  "latedef":  "nofunc",
-  "laxbreak": true,
-  "loopfunc": true,
-  "noarg":    true,
-  "noempty":  true,
-  "nonew":    true,
-  "trailing": true,
-  "-W082":    false
+  "curly":     true,
+  "eqeqeq":    true,
+  "evil":      true,
+  "forin":     true,
+  "freeze":    true,
+  "immed":     true,
+  "latedef":   "nofunc",
+  "laxbreak":  true,
+  "loopfunc":  true,
+  "newcap":    false,
+  "noarg":     true,
+  "noempty":   true,
+  "nonew":     true,
+  "trailing":  true,
+  "validthis": true,
+  "-W082":     false
 }
diff --git a/lib/compiler/passes/generate-javascript.js b/lib/compiler/passes/generate-javascript.js
index eddf6fd..1268774 100644
--- a/lib/compiler/passes/generate-javascript.js
+++ b/lib/compiler/passes/generate-javascript.js
@@ -761,6 +761,8 @@ function generateJavascript(ast, options) {
 
   parts.push([
     '(function() {',
+    '  "use strict";',
+    '',
     '  /*',
     '   * Generated by PEG.js 0.8.0.',
     '   *',
@@ -1147,7 +1149,7 @@ function generateJavascript(ast, options) {
   }
 
   if (ast.initializer) {
-    parts.push(indent4("{" + ast.initializer.code + "}"));
+    parts.push(indent4(ast.initializer.code));
     parts.push('');
   }
 
diff --git a/lib/parser.js b/lib/parser.js
index 48078e6..b6b677f 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -1,4 +1,6 @@
 module.exports = (function() {
+  "use strict";
+
   /*
    * Generated by PEG.js 0.8.0.
    *
@@ -4893,7 +4895,7 @@ module.exports = (function() {
       return s0;
     }
 
-    {
+
       var OPS_TO_PREFIXED_TYPES = {
         "$": "text",
         "&": "simple_and",
@@ -4940,7 +4942,7 @@ module.exports = (function() {
       function buildList(first, rest, index) {
         return [first].concat(extractList(rest, index));
       }
-    }
+
 
     peg$result = peg$startRuleFunction();