diff --git a/package.json b/package.json
index 3b65cc8..ffb5d48 100644
--- a/package.json
+++ b/package.json
@@ -32,12 +32,14 @@
   ],
   "dependencies": {
     "convert-source-map": "^1.1.3",
-    "offset-sourcemap-lines": "^0.1.0",
+    "offset-sourcemap-lines": "^0.1.1",
     "oss-license-name-to-url": "^1.2.1",
     "through2": "^2.0.0",
     "type-name": "^2.0.0"
   },
   "devDependencies": {
+    "babel-plugin-transform-es2015-classes": "^6.8.0",
+    "babelify": "^7.3.0",
     "browserify": "^13.0.0",
     "event-stream": "^3.3.1",
     "intelli-espower-loader": "^1.0.0",
diff --git a/test/test-babel-class/index.js b/test/test-babel-class/index.js
new file mode 100644
index 0000000..d670a75
--- /dev/null
+++ b/test/test-babel-class/index.js
@@ -0,0 +1,8 @@
+class Entry {
+    constructor(name) {
+        this.name = name;
+    }
+    toString() {
+        return this.name;
+    }
+}
diff --git a/test/test-babel-class/package.json b/test/test-babel-class/package.json
new file mode 100644
index 0000000..b1fe8da
--- /dev/null
+++ b/test/test-babel-class/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "test-babel-class",
+  "description": "",
+  "version": "0.1.0",
+  "license": "MIT"
+}
diff --git a/test/test.js b/test/test.js
index 07b0061..c766288 100644
--- a/test/test.js
+++ b/test/test.js
@@ -380,3 +380,33 @@ describe('multiple common licenses', function () {
         });
     });
 });
+
+
+describe('repro case for #17 : sourcemap generated by babel class', function () {
+    var expectedModules = [
+        'test-babel-class'
+    ];
+    describe('sourcemap should be generated', function () {
+        var header;
+        before(function (done) {
+            var save = saveFirstChunk();
+            var entryPath = path.normalize(path.join(__dirname, 'test-babel-class', 'index.js'));
+            var b = browserify(entryPath, { debug: true });
+            b.transform('babelify', {
+                plugins: ['transform-es2015-classes']
+            });
+            b.plugin(licensify);
+            b.bundle().pipe(save).pipe(es.wait(function(err, data) {
+                assert(!err);
+                header = save.firstChunk;
+                done();
+            }));
+        });
+        expectedModules.forEach(function (moduleName) {
+            var re = new RegExp(' \* ' + moduleName + '\:$', 'gm');
+            it('ensure header includes [' + moduleName + ']', function () {
+                assert(re.test(header));
+            });
+        });
+    });
+});