diff --git a/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663-2/actual.js b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663-2/actual.js
new file mode 100644
index 0000000000..9f5c34b067
--- /dev/null
+++ b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663-2/actual.js
@@ -0,0 +1,6 @@
+import React from 'react'
+export default class Button extends React.Component {
+  render() {
+    return <button>foo</button>
+  }
+}
diff --git a/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663-2/expected.js b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663-2/expected.js
new file mode 100644
index 0000000000..127b4fcbe8
--- /dev/null
+++ b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663-2/expected.js
@@ -0,0 +1,32 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var _react = require('react');
+
+var _react2 = babelHelpers.interopRequireDefault(_react);
+
+var Button = (function (_React$Component) {
+  babelHelpers.inherits(Button, _React$Component);
+
+  function Button() {
+    babelHelpers.classCallCheck(this, Button);
+    return babelHelpers.possibleConstructorReturn(this, Object.getPrototypeOf(Button).apply(this, arguments));
+  }
+
+  babelHelpers.createClass(Button, [{
+    key: 'render',
+    value: function render() {
+      return _react2.default.createElement(
+        'button',
+        null,
+        'foo'
+      );
+    }
+  }]);
+  return Button;
+})(_react2.default.Component);
+
+exports.default = Button;
diff --git a/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663-2/options.json b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663-2/options.json
new file mode 100644
index 0000000000..fa4caa55e4
--- /dev/null
+++ b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663-2/options.json
@@ -0,0 +1,4 @@
+{
+  "presets": ["es2015", "react"],
+  "plugins": ["transform-class-properties", "external-helpers-2"]
+}
diff --git a/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663/actual.js b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663/actual.js
new file mode 100644
index 0000000000..d109d29c35
--- /dev/null
+++ b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663/actual.js
@@ -0,0 +1,23 @@
+import net from 'net';
+import { EventEmitter } from 'events';
+import BinarySerializer from './helpers/binary-serializer';
+// import ...
+
+export default class Connection extends EventEmitter {
+    constructor(endpoint, joinKey, joinData, roomId) {
+        super();
+
+        this.isConnected = false;
+        this.roomId = roomId;
+
+        // ...
+    }
+
+    send(message) {
+        this.sock.write(BinarySerializer.serializeMessage(message));
+    }
+
+    disconnect() {
+        this.sock.close();
+    }
+}
diff --git a/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663/expected.js b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663/expected.js
new file mode 100644
index 0000000000..7296efa18e
--- /dev/null
+++ b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663/expected.js
@@ -0,0 +1,48 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+
+var _net = require('net');
+
+var _net2 = babelHelpers.interopRequireDefault(_net);
+
+var _events = require('events');
+
+var _binarySerializer = require('./helpers/binary-serializer');
+
+var _binarySerializer2 = babelHelpers.interopRequireDefault(_binarySerializer);
+
+// import ...
+
+var Connection = (function (_EventEmitter) {
+    babelHelpers.inherits(Connection, _EventEmitter);
+
+    function Connection(endpoint, joinKey, joinData, roomId) {
+        babelHelpers.classCallCheck(this, Connection);
+
+        var _this = babelHelpers.possibleConstructorReturn(this, Object.getPrototypeOf(Connection).call(this));
+
+        _this.isConnected = false;
+        _this.roomId = roomId;
+
+        // ...
+        return _this;
+    }
+
+    babelHelpers.createClass(Connection, [{
+        key: 'send',
+        value: function send(message) {
+            this.sock.write(_binarySerializer2.default.serializeMessage(message));
+        }
+    }, {
+        key: 'disconnect',
+        value: function disconnect() {
+            this.sock.close();
+        }
+    }]);
+    return Connection;
+})(_events.EventEmitter);
+
+exports.default = Connection;
diff --git a/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/options.json b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/options.json
new file mode 100644
index 0000000000..4713c96921
--- /dev/null
+++ b/packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": ["external-helpers-2"],
+  "presets": ["es2015"]
+}