diff --git a/lib/compiler/passes/generate-bytecode.js b/lib/compiler/passes/generate-bytecode.js
index 06fc78f..b009b92 100644
--- a/lib/compiler/passes/generate-bytecode.js
+++ b/lib/compiler/passes/generate-bytecode.js
@@ -603,7 +603,7 @@ function generateBytecode(ast) {
     },
 
     "class": function(node) {
-      var regexp, description, regexpIndex, expectedIndex;
+      var regexp, parts, description, regexpIndex, expectedIndex;
 
       if (node.parts.length > 0) {
         regexp = '/^['
@@ -624,6 +624,14 @@ function generateBytecode(ast) {
         regexp = node.inverted ? '/^[\\S\\s]/' : '/^(?!)/';
       }
 
+      parts = '['
+        + arrays.map(node.parts, function(part) {
+            return part instanceof Array
+              ? '["' + js.stringEscape(part[0]) + '", "' + js.stringEscape(part[1]) + '"]'
+              : '"' + js.stringEscape(part) + '"';
+          }).join(', ')
+        + ']';
+
       description = "["
         + (node.inverted ? "^" : "")
         + arrays.map(node.parts, function(part) {
@@ -639,7 +647,9 @@ function generateBytecode(ast) {
       expectedIndex = addConst([
         '{',
         'type: "class",',
-        'value: "' + js.stringEscape(node.rawText) + '",',
+        'parts: ' + parts + ',',
+        'inverted: ' + node.inverted + ',',
+        'ignoreCase: ' + node.ignoreCase + ',',
         'description: "' + js.stringEscape(description) + '"',
         '}'
       ].join(' '));
diff --git a/spec/behavior/generated-parser-behavior.spec.js b/spec/behavior/generated-parser-behavior.spec.js
index cb2955c..24975a2 100644
--- a/spec/behavior/generated-parser-behavior.spec.js
+++ b/spec/behavior/generated-parser-behavior.spec.js
@@ -344,7 +344,7 @@ describe("generated parser behavior", function() {
           var parser = peg.generate('start = [a]', options);
 
           expect(parser).toFailToParse("b", {
-            expected: [{ type: "class", value: "[a]", description: "[a]" }]
+            expected: [{ type: "class", parts: ["a"], inverted: false, ignoreCase: false, description: "[a]" }]
           });
         });
       });
diff --git a/spec/unit/compiler/passes/generate-bytecode.spec.js b/spec/unit/compiler/passes/generate-bytecode.spec.js
index 0e8ebfa..a73effd 100644
--- a/spec/unit/compiler/passes/generate-bytecode.spec.js
+++ b/spec/unit/compiler/passes/generate-bytecode.spec.js
@@ -598,7 +598,7 @@ describe("compiler pass |generateBytecode|", function() {
       it("defines correct constants", function() {
         expect(pass).toChangeAST('start = [a]', constsDetails([
           '/^[a]/',
-          '{ type: "class", value: "[a]", description: "[a]" }'
+          '{ type: "class", parts: ["a"], inverted: false, ignoreCase: false, description: "[a]" }'
         ]));
       });
     });
@@ -607,7 +607,7 @@ describe("compiler pass |generateBytecode|", function() {
       it("defines correct constants", function() {
         expect(pass).toChangeAST('start = [^a]', constsDetails([
           '/^[^a]/',
-          '{ type: "class", value: "[^a]", description: "[^a]" }'
+          '{ type: "class", parts: ["a"], inverted: true, ignoreCase: false, description: "[^a]" }'
         ]));
       });
     });
@@ -616,7 +616,7 @@ describe("compiler pass |generateBytecode|", function() {
       it("defines correct constants", function() {
         expect(pass).toChangeAST('start = [a]i', constsDetails([
           '/^[a]/i',
-          '{ type: "class", value: "[a]i", description: "[a]" }'
+          '{ type: "class", parts: ["a"], inverted: false, ignoreCase: true, description: "[a]" }'
         ]));
       });
     });
@@ -625,7 +625,7 @@ describe("compiler pass |generateBytecode|", function() {
       it("defines correct constants", function() {
         expect(pass).toChangeAST('start = [ab-def-hij-l]', constsDetails([
           '/^[ab-def-hij-l]/',
-          '{ type: "class", value: "[ab-def-hij-l]", description: "[ab-def-hij-l]" }'
+          '{ type: "class", parts: ["a", ["b", "d"], "e", ["f", "h"], "i", ["j", "l"]], inverted: false, ignoreCase: false, description: "[ab-def-hij-l]" }'
         ]));
       });
     });
@@ -634,7 +634,7 @@ describe("compiler pass |generateBytecode|", function() {
       it("defines correct constants", function() {
         expect(pass).toChangeAST('start = []', constsDetails([
           '/^(?!)/',
-          '{ type: "class", value: "[]", description: "[]" }'
+          '{ type: "class", parts: [], inverted: false, ignoreCase: false, description: "[]" }'
         ]));
       });
     });
@@ -643,7 +643,7 @@ describe("compiler pass |generateBytecode|", function() {
       it("defines correct constants", function() {
         expect(pass).toChangeAST('start = [^]', constsDetails([
           '/^[\\S\\s]/',
-          '{ type: "class", value: "[^]", description: "[^]" }'
+          '{ type: "class", parts: [], inverted: true, ignoreCase: false, description: "[^]" }'
         ]));
       });
     });