diff --git a/lib/compiler/asts.js b/lib/compiler/asts.js
index f76b6c4..cfb1f72 100644
--- a/lib/compiler/asts.js
+++ b/lib/compiler/asts.js
@@ -65,7 +65,7 @@ let asts = {
         return node.value !== "";
       },
 
-      "class": consumesTrue,
+      class: consumesTrue,
       any: consumesTrue
     });
 
diff --git a/lib/compiler/passes/generate-bytecode.js b/lib/compiler/passes/generate-bytecode.js
index 63d0b44..fdebde4 100644
--- a/lib/compiler/passes/generate-bytecode.js
+++ b/lib/compiler/passes/generate-bytecode.js
@@ -567,7 +567,7 @@ function generateBytecode(ast) {
       }
     },
 
-    "class": function(node) {
+    class: function(node) {
       let regexp = "/^["
         + (node.inverted ? "^" : "")
         + node.parts.map(part =>
diff --git a/lib/compiler/passes/generate-js.js b/lib/compiler/passes/generate-js.js
index 8f82e2a..f90b3ba 100644
--- a/lib/compiler/passes/generate-js.js
+++ b/lib/compiler/passes/generate-js.js
@@ -771,7 +771,7 @@ function generateJS(ast, options) {
       "      return \"\\\"\" + literalEscape(expectation.text) + \"\\\"\";",
       "    },",
       "",
-      "    \"class\": function(expectation) {",
+      "    class: function(expectation) {",
       "      var escapedParts = expectation.parts.map(function(part) {",
       "        return Array.isArray(part)",
       "          ? classEscape(part[0]) + \"-\" + classEscape(part[1])",
diff --git a/lib/compiler/visitor.js b/lib/compiler/visitor.js
index b51084d..9bcf186 100644
--- a/lib/compiler/visitor.js
+++ b/lib/compiler/visitor.js
@@ -56,7 +56,7 @@ let visitor = {
       semantic_not: visitNop,
       rule_ref: visitNop,
       literal: visitNop,
-      "class": visitNop,
+      class: visitNop,
       any: visitNop
     };
 
diff --git a/lib/parser.js b/lib/parser.js
index 61c51cb..7c24457 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -32,7 +32,7 @@ peg$SyntaxError.buildMessage = function(expected, found) {
       return "\"" + literalEscape(expectation.text) + "\"";
     },
 
-    "class": function(expectation) {
+    class: function(expectation) {
       var escapedParts = expectation.parts.map(function(part) {
         return Array.isArray(part)
           ? classEscape(part[0]) + "-" + classEscape(part[1])
diff --git a/spec/unit/parser.spec.js b/spec/unit/parser.spec.js
index 0dc6482..10a2859 100644
--- a/spec/unit/parser.spec.js
+++ b/spec/unit/parser.spec.js
@@ -156,7 +156,7 @@ describe("PEG.js grammar parser", function() {
       semantic_not: stripLeaf,
       rule_ref: stripLeaf,
       literal: stripLeaf,
-      "class": stripLeaf,
+      class: stripLeaf,
       any: stripLeaf
     });