trouble with webpack

I'm using webpack (with babel-loader), and get this error when I import react-geocoder:

ERROR in ./~/react-geocoder/index.js
Module parse failed: /Users/me/project/node_modules/react-geocoder/index.js Line 9:
Unexpected token (
You may need an appropriate loader to handle this file type.
|  */
| var Geocoder = React.createClass({
|   getDefaultProps() {
|     return {
|       endpoint: 'https://api.tiles.mapbox.com',
@ ./static/app/scripts/components/ListProperty/ListPropertyLocationField.jsx 25:21-46

This is most likely a webpack config problem, but I'm hoping someone here knows how to help. My webpack config:

var config = {
    entry: './static/app/scripts/main.js',
    output: {
      path: __dirname,
      filename: 'main.js'
    },
    debug : isDev,
    module: {
      loaders: [{
          test: /\.jsx?$/,
          exclude: /node_modules/,
          loader: 'babel'
      }]
    }
  };

Start with the webpack configuration and the failing import in react-geocoder/index.js, using static/app/scripts/components/ListProperty/ListPropertyLocationField.jsx and static/app/scripts/main.js as the reproduction path. Run the reported webpack build and verify that importing react-geocoder compiles without the module parse error; no specific test is mentioned.