diff --git a/lib/compiler/passes/generate-js.js b/lib/compiler/passes/generate-js.js
index e70d99e..aafc4e5 100644
--- a/lib/compiler/passes/generate-js.js
+++ b/lib/compiler/passes/generate-js.js
@@ -788,7 +788,7 @@ function generateJS(ast, options) {
       '          return "\\\"" + literalEscape(expectation.text) + "\\\"";',
       '        },',
       '',
-      '        class: function(expectation) {',
+      '        "class": function(expectation) {',
       '          var escapedParts = "",',
       '              i;',
       '',
diff --git a/lib/parser.js b/lib/parser.js
index 666f2f5..17c6230 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -35,7 +35,7 @@ peg$SyntaxError.buildMessage = function(expected, found) {
           return "\"" + literalEscape(expectation.text) + "\"";
         },
 
-        class: function(expectation) {
+        "class": function(expectation) {
           var escapedParts = "",
               i;