diff --git a/lexer.js b/lexer.js
index 1614fd9..aa06c38 100755
--- a/lexer.js
+++ b/lexer.js
@@ -158,7 +158,8 @@ function parseSource (cjsSource) {
         }
         break;
       case 99/*c*/:
-        if (keywordStart(pos) && source.startsWith('lass', pos + 1) && isBrOrWs(source.charCodeAt(pos + 5)))
+        if (source.charCodeAt(pos + 1) === 108/*l*/ && keywordStart(pos) &&
+            source.startsWith('ass', pos + 2) && isBrOrWs(source.charCodeAt(pos + 5)))
           nextBraceIsClass = true;
         break;
       case 109/*m*/:
diff --git a/test/_unit.js b/test/_unit.js
index 0458f17..fdf9996 100755
--- a/test/_unit.js
+++ b/test/_unit.js
@@ -478,6 +478,23 @@ suite('Lexer', () => {
     `);
   });
 
+  test('Class keyword detection', () => {
+    for (const whitespace of ['\t', '\n', '\v', '\f', '\r', ' ', '\u00a0']) {
+      const result = parse(`class${whitespace}Example {}/regex/.test('regex'); exports.value = 1`);
+      assert.deepStrictEqual(result.exports, ['value']);
+      assert.deepStrictEqual(result.reexports, []);
+    }
+    for (const source of [
+      'const className = {} / 2; exports.value = className',
+      'const close = {} / 2; exports.value = close',
+      'const value = {}; value.class = {} / 2; exports.value = value'
+    ]) {
+      const result = parse(source);
+      assert.deepStrictEqual(result.exports, ['value']);
+      assert.deepStrictEqual(result.reexports, []);
+    }
+  });
+
   test('Regexp division', () => {
     parse(`\nconst x = num / /'/.exec(l)[0].slice(1, -1)//'"`);
   });