diff --git a/index.js b/index.js
index d27b2f1a..404a0a48 100644
--- a/index.js
+++ b/index.js
@@ -751,6 +751,14 @@ const publicApi = {
 // if the webpackConfig object hasn't been initialized yet.
 const publicApiProxy = new Proxy(publicApi, {
     get: (target, prop) => {
+        if (prop === '__esModule') {
+            // When using Babel to preprocess a webpack.config.babel.js file
+            // (for instance if we want to use ES6 syntax) the __esModule
+            // property needs to be whitelisted to avoid an "Unknown property"
+            // error.
+            return target[prop];
+        }
+
         if (typeof target[prop] === 'function') {
             // These methods of the public API can be called even if the
             // webpackConfig object hasn't been initialized yet.
diff --git a/package.json b/package.json
index cec36f1f..e09e668c 100644
--- a/package.json
+++ b/package.json
@@ -51,6 +51,7 @@
   "devDependencies": {
     "autoprefixer": "^6.7.7",
     "babel-plugin-transform-react-jsx": "^6.24.1",
+    "babel-preset-es2015": "^6.24.1",
     "babel-preset-react": "^6.23.0",
     "chai": "^3.5.0",
     "chai-fs": "^1.0.0",
diff --git a/test/bin/encore.js b/test/bin/encore.js
index 7a9dc8f7..ff838431 100644
--- a/test/bin/encore.js
+++ b/test/bin/encore.js
@@ -47,4 +47,45 @@ module.exports = Encore.getWebpackConfig();
             done();
         });
     });
+
+    it('Smoke test using webpack.config.babel.js', (done) => {
+        testSetup.emptyTmpDir();
+        const testDir = testSetup.createTestAppDir();
+
+        fs.writeFileSync(
+            path.join(testDir, '.babelrc'),
+            `
+{
+    "presets": [
+        ["es2015", { "modules": "commonjs"}]
+    ]
+}
+            `
+        );
+
+        fs.writeFileSync(
+            path.join(testDir, 'webpack.config.babel.js'),
+            `
+import Encore from '../../index.js';
+
+Encore
+    .setOutputPath('build/')
+    .setPublicPath('/build')
+    .addEntry('main', './js/no_require')
+;
+
+const config = Encore.getWebpackConfig();
+export default config;
+            `
+        );
+
+        const binPath = path.resolve(__dirname, '../', '../', 'bin', 'encore.js');
+        exec(`node ${binPath} dev --context=${testDir}`, { cwd: testDir }, (err, stdout, stderr) => {
+            if (err) {
+                throw new Error(`Error executing encore: ${err} ${stderr} ${stdout}`);
+            }
+
+            done();
+        });
+    });
 });
diff --git a/yarn.lock b/yarn.lock
index 8d9fcdd2..85a358b7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -291,6 +291,14 @@ babel-code-frame@^6.11.0, babel-code-frame@^6.16.0, babel-code-frame@^6.22.0:
     esutils "^2.0.2"
     js-tokens "^3.0.0"
 
+babel-code-frame@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-code-frame/-/babel-code-frame-6.26.0.tgz#63fd43f7dc1e3bb7ce35947db8fe369a3f58c74b"
+  dependencies:
+    chalk "^1.1.3"
+    esutils "^2.0.2"
+    js-tokens "^3.0.2"
+
 babel-core@^6.24.0, babel-core@^6.24.1:
   version "6.25.0"
   resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.25.0.tgz#7dd42b0463c742e9d5296deb3ec67a9322dad729"
@@ -507,7 +515,17 @@ babel-plugin-transform-es2015-block-scoping@^6.23.0:
     babel-types "^6.24.1"
     lodash "^4.2.0"
 
-babel-plugin-transform-es2015-classes@^6.23.0:
+babel-plugin-transform-es2015-block-scoping@^6.24.1:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-block-scoping/-/babel-plugin-transform-es2015-block-scoping-6.26.0.tgz#d70f5299c1308d05c12f463813b0a09e73b1895f"
+  dependencies:
+    babel-runtime "^6.26.0"
+    babel-template "^6.26.0"
+    babel-traverse "^6.26.0"
+    babel-types "^6.26.0"
+    lodash "^4.17.4"
+
+babel-plugin-transform-es2015-classes@^6.23.0, babel-plugin-transform-es2015-classes@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-classes/-/babel-plugin-transform-es2015-classes-6.24.1.tgz#5a4c58a50c9c9461e564b4b2a3bfabc97a2584db"
   dependencies:
@@ -521,33 +539,33 @@ babel-plugin-transform-es2015-classes@^6.23.0:
     babel-traverse "^6.24.1"
     babel-types "^6.24.1"
 
-babel-plugin-transform-es2015-computed-properties@^6.22.0:
+babel-plugin-transform-es2015-computed-properties@^6.22.0, babel-plugin-transform-es2015-computed-properties@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-computed-properties/-/babel-plugin-transform-es2015-computed-properties-6.24.1.tgz#6fe2a8d16895d5634f4cd999b6d3480a308159b3"
   dependencies:
     babel-runtime "^6.22.0"
     babel-template "^6.24.1"
 
-babel-plugin-transform-es2015-destructuring@^6.23.0:
+babel-plugin-transform-es2015-destructuring@^6.22.0, babel-plugin-transform-es2015-destructuring@^6.23.0:
   version "6.23.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-destructuring/-/babel-plugin-transform-es2015-destructuring-6.23.0.tgz#997bb1f1ab967f682d2b0876fe358d60e765c56d"
   dependencies:
     babel-runtime "^6.22.0"
 
-babel-plugin-transform-es2015-duplicate-keys@^6.22.0:
+babel-plugin-transform-es2015-duplicate-keys@^6.22.0, babel-plugin-transform-es2015-duplicate-keys@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-duplicate-keys/-/babel-plugin-transform-es2015-duplicate-keys-6.24.1.tgz#73eb3d310ca969e3ef9ec91c53741a6f1576423e"
   dependencies:
     babel-runtime "^6.22.0"
     babel-types "^6.24.1"
 
-babel-plugin-transform-es2015-for-of@^6.23.0:
+babel-plugin-transform-es2015-for-of@^6.22.0, babel-plugin-transform-es2015-for-of@^6.23.0:
   version "6.23.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-for-of/-/babel-plugin-transform-es2015-for-of-6.23.0.tgz#f47c95b2b613df1d3ecc2fdb7573623c75248691"
   dependencies:
     babel-runtime "^6.22.0"
 
-babel-plugin-transform-es2015-function-name@^6.22.0:
+babel-plugin-transform-es2015-function-name@^6.22.0, babel-plugin-transform-es2015-function-name@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-function-name/-/babel-plugin-transform-es2015-function-name-6.24.1.tgz#834c89853bc36b1af0f3a4c5dbaa94fd8eacaa8b"
   dependencies:
@@ -578,7 +596,7 @@ babel-plugin-transform-es2015-modules-commonjs@^6.23.0, babel-plugin-transform-e
     babel-template "^6.24.1"
     babel-types "^6.24.1"
 
-babel-plugin-transform-es2015-modules-systemjs@^6.23.0:
+babel-plugin-transform-es2015-modules-systemjs@^6.23.0, babel-plugin-transform-es2015-modules-systemjs@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-modules-systemjs/-/babel-plugin-transform-es2015-modules-systemjs-6.24.1.tgz#ff89a142b9119a906195f5f106ecf305d9407d23"
   dependencies:
@@ -586,7 +604,7 @@ babel-plugin-transform-es2015-modules-systemjs@^6.23.0:
     babel-runtime "^6.22.0"
     babel-template "^6.24.1"
 
-babel-plugin-transform-es2015-modules-umd@^6.23.0:
+babel-plugin-transform-es2015-modules-umd@^6.23.0, babel-plugin-transform-es2015-modules-umd@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-modules-umd/-/babel-plugin-transform-es2015-modules-umd-6.24.1.tgz#ac997e6285cd18ed6176adb607d602344ad38468"
   dependencies:
@@ -594,14 +612,14 @@ babel-plugin-transform-es2015-modules-umd@^6.23.0:
     babel-runtime "^6.22.0"
     babel-template "^6.24.1"
 
-babel-plugin-transform-es2015-object-super@^6.22.0:
+babel-plugin-transform-es2015-object-super@^6.22.0, babel-plugin-transform-es2015-object-super@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-object-super/-/babel-plugin-transform-es2015-object-super-6.24.1.tgz#24cef69ae21cb83a7f8603dad021f572eb278f8d"
   dependencies:
     babel-helper-replace-supers "^6.24.1"
     babel-runtime "^6.22.0"
 
-babel-plugin-transform-es2015-parameters@^6.23.0:
+babel-plugin-transform-es2015-parameters@^6.23.0, babel-plugin-transform-es2015-parameters@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-parameters/-/babel-plugin-transform-es2015-parameters-6.24.1.tgz#57ac351ab49caf14a97cd13b09f66fdf0a625f2b"
   dependencies:
@@ -612,7 +630,7 @@ babel-plugin-transform-es2015-parameters@^6.23.0:
     babel-traverse "^6.24.1"
     babel-types "^6.24.1"
 
-babel-plugin-transform-es2015-shorthand-properties@^6.22.0:
+babel-plugin-transform-es2015-shorthand-properties@^6.22.0, babel-plugin-transform-es2015-shorthand-properties@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-shorthand-properties/-/babel-plugin-transform-es2015-shorthand-properties-6.24.1.tgz#24f875d6721c87661bbd99a4622e51f14de38aa0"
   dependencies:
@@ -625,7 +643,7 @@ babel-plugin-transform-es2015-spread@^6.22.0:
   dependencies:
     babel-runtime "^6.22.0"
 
-babel-plugin-transform-es2015-sticky-regex@^6.22.0:
+babel-plugin-transform-es2015-sticky-regex@^6.22.0, babel-plugin-transform-es2015-sticky-regex@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-sticky-regex/-/babel-plugin-transform-es2015-sticky-regex-6.24.1.tgz#00c1cdb1aca71112cdf0cf6126c2ed6b457ccdbc"
   dependencies:
@@ -639,13 +657,13 @@ babel-plugin-transform-es2015-template-literals@^6.22.0:
   dependencies:
     babel-runtime "^6.22.0"
 
-babel-plugin-transform-es2015-typeof-symbol@^6.23.0:
+babel-plugin-transform-es2015-typeof-symbol@^6.22.0, babel-plugin-transform-es2015-typeof-symbol@^6.23.0:
   version "6.23.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-typeof-symbol/-/babel-plugin-transform-es2015-typeof-symbol-6.23.0.tgz#dec09f1cddff94b52ac73d505c84df59dcceb372"
   dependencies:
     babel-runtime "^6.22.0"
 
-babel-plugin-transform-es2015-unicode-regex@^6.22.0:
+babel-plugin-transform-es2015-unicode-regex@^6.22.0, babel-plugin-transform-es2015-unicode-regex@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-unicode-regex/-/babel-plugin-transform-es2015-unicode-regex-6.24.1.tgz#d38b12f42ea7323f729387f18a7c5ae1faeb35e9"
   dependencies:
@@ -702,6 +720,12 @@ babel-plugin-transform-regenerator@^6.22.0:
   dependencies:
     regenerator-transform "0.9.11"
 
+babel-plugin-transform-regenerator@^6.24.1:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-regenerator/-/babel-plugin-transform-regenerator-6.26.0.tgz#e0703696fbde27f0a3efcacf8b4dca2f7b3a8f2f"
+  dependencies:
+    regenerator-transform "^0.10.0"
+
 babel-plugin-transform-strict-mode@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-strict-mode/-/babel-plugin-transform-strict-mode-6.24.1.tgz#d5faf7aa578a65bbe591cf5edae04a0c67020758"
@@ -744,6 +768,35 @@ babel-preset-env@^1.2.2:
     invariant "^2.2.2"
     semver "^5.3.0"
 
+babel-preset-es2015@^6.24.1:
+  version "6.24.1"
+  resolved "https://registry.yarnpkg.com/babel-preset-es2015/-/babel-preset-es2015-6.24.1.tgz#d44050d6bc2c9feea702aaf38d727a0210538939"
+  dependencies:
+    babel-plugin-check-es2015-constants "^6.22.0"
+    babel-plugin-transform-es2015-arrow-functions "^6.22.0"
+    babel-plugin-transform-es2015-block-scoped-functions "^6.22.0"
+    babel-plugin-transform-es2015-block-scoping "^6.24.1"
+    babel-plugin-transform-es2015-classes "^6.24.1"
+    babel-plugin-transform-es2015-computed-properties "^6.24.1"
+    babel-plugin-transform-es2015-destructuring "^6.22.0"
+    babel-plugin-transform-es2015-duplicate-keys "^6.24.1"
+    babel-plugin-transform-es2015-for-of "^6.22.0"
+    babel-plugin-transform-es2015-function-name "^6.24.1"
+    babel-plugin-transform-es2015-literals "^6.22.0"
+    babel-plugin-transform-es2015-modules-amd "^6.24.1"
+    babel-plugin-transform-es2015-modules-commonjs "^6.24.1"
+    babel-plugin-transform-es2015-modules-systemjs "^6.24.1"
+    babel-plugin-transform-es2015-modules-umd "^6.24.1"
+    babel-plugin-transform-es2015-object-super "^6.24.1"
+    babel-plugin-transform-es2015-parameters "^6.24.1"
+    babel-plugin-transform-es2015-shorthand-properties "^6.24.1"
+    babel-plugin-transform-es2015-spread "^6.22.0"
+    babel-plugin-transform-es2015-sticky-regex "^6.24.1"
+    babel-plugin-transform-es2015-template-literals "^6.22.0"
+    babel-plugin-transform-es2015-typeof-symbol "^6.22.0"
+    babel-plugin-transform-es2015-unicode-regex "^6.24.1"
+    babel-plugin-transform-regenerator "^6.24.1"
+
 babel-preset-flow@^6.23.0:
   version "6.23.0"
   resolved "https://registry.yarnpkg.com/babel-preset-flow/-/babel-preset-flow-6.23.0.tgz#e71218887085ae9a24b5be4169affb599816c49d"
@@ -786,6 +839,13 @@ babel-runtime@^6.18.0, babel-runtime@^6.22.0:
     core-js "^2.4.0"
     regenerator-runtime "^0.10.0"
 
+babel-runtime@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-runtime/-/babel-runtime-6.26.0.tgz#965c7058668e82b55d7bfe04ff2337bc8b5647fe"
+  dependencies:
+    core-js "^2.4.0"
+    regenerator-runtime "^0.11.0"
+
 babel-template@^6.24.1, babel-template@^6.25.0:
   version "6.25.0"
   resolved "https://registry.yarnpkg.com/babel-template/-/babel-template-6.25.0.tgz#665241166b7c2aa4c619d71e192969552b10c071"
@@ -796,6 +856,16 @@ babel-template@^6.24.1, babel-template@^6.25.0:
     babylon "^6.17.2"
     lodash "^4.2.0"
 
+babel-template@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-template/-/babel-template-6.26.0.tgz#de03e2d16396b069f46dd9fff8521fb1a0e35e02"
+  dependencies:
+    babel-runtime "^6.26.0"
+    babel-traverse "^6.26.0"
+    babel-types "^6.26.0"
+    babylon "^6.18.0"
+    lodash "^4.17.4"
+
 babel-traverse@^6.24.1, babel-traverse@^6.25.0:
   version "6.25.0"
   resolved "https://registry.yarnpkg.com/babel-traverse/-/babel-traverse-6.25.0.tgz#2257497e2fcd19b89edc13c4c91381f9512496f1"
@@ -810,6 +880,20 @@ babel-traverse@^6.24.1, babel-traverse@^6.25.0:
     invariant "^2.2.0"
     lodash "^4.2.0"
 
+babel-traverse@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-traverse/-/babel-traverse-6.26.0.tgz#46a9cbd7edcc62c8e5c064e2d2d8d0f4035766ee"
+  dependencies:
+    babel-code-frame "^6.26.0"
+    babel-messages "^6.23.0"
+    babel-runtime "^6.26.0"
+    babel-types "^6.26.0"
+    babylon "^6.18.0"
+    debug "^2.6.8"
+    globals "^9.18.0"
+    invariant "^2.2.2"
+    lodash "^4.17.4"
+
 babel-types@^6.19.0, babel-types@^6.24.1, babel-types@^6.25.0:
   version "6.25.0"
   resolved "https://registry.yarnpkg.com/babel-types/-/babel-types-6.25.0.tgz#70afb248d5660e5d18f811d91c8303b54134a18e"
@@ -819,10 +903,23 @@ babel-types@^6.19.0, babel-types@^6.24.1, babel-types@^6.25.0:
     lodash "^4.2.0"
     to-fast-properties "^1.0.1"
 
+babel-types@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-types/-/babel-types-6.26.0.tgz#a3b073f94ab49eb6fa55cd65227a334380632497"
+  dependencies:
+    babel-runtime "^6.26.0"
+    esutils "^2.0.2"
+    lodash "^4.17.4"
+    to-fast-properties "^1.0.3"
+
 babylon@^6.17.2:
   version "6.17.4"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.17.4.tgz#3e8b7402b88d22c3423e137a1577883b15ff869a"
 
+babylon@^6.18.0:
+  version "6.18.0"
+  resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.18.0.tgz#af2f3b88fa6f5c1e4c634d1a0f8eac4f55b395e3"
+
 balanced-match@^0.4.2:
   version "0.4.2"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-0.4.2.tgz#cb3f3e3c732dc0f01ee70b403f302e61d7709838"
@@ -2465,7 +2562,7 @@ glob@^7.0.0, glob@^7.0.3, glob@^7.0.5, glob@~7.1.1:
     once "^1.3.0"
     path-is-absolute "^1.0.0"
 
-globals@^9.0.0, globals@^9.14.0:
+globals@^9.0.0, globals@^9.14.0, globals@^9.18.0:
   version "9.18.0"
   resolved "https://registry.yarnpkg.com/globals/-/globals-9.18.0.tgz#aa3896b3e69b487f17e31ed2143d69a8e30c2d8a"
 
@@ -3027,7 +3124,7 @@ js-beautify@^1.6.3:
     mkdirp "~0.5.0"
     nopt "~3.0.1"
 
-js-tokens@^3.0.0:
+js-tokens@^3.0.0, js-tokens@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
 
@@ -3354,7 +3451,7 @@ lodash.uniq@^4.5.0:
   version "4.5.0"
   resolved "https://registry.yarnpkg.com/lodash.uniq/-/lodash.uniq-4.5.0.tgz#d0225373aeb652adc1bc82e4945339a842754773"
 
-"lodash@>=3.5 <5", lodash@^4.0.0, lodash@^4.14.0, lodash@^4.17.2, lodash@^4.2.0, lodash@^4.3.0, lodash@~4.17.4:
+"lodash@>=3.5 <5", lodash@^4.0.0, lodash@^4.14.0, lodash@^4.17.2, lodash@^4.17.4, lodash@^4.2.0, lodash@^4.3.0, lodash@~4.17.4:
   version "4.17.4"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
 
@@ -4649,6 +4746,10 @@ regenerator-runtime@^0.10.0:
   version "0.10.5"
   resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.10.5.tgz#336c3efc1220adcedda2c9fab67b5a7955a33658"
 
+regenerator-runtime@^0.11.0:
+  version "0.11.0"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.11.0.tgz#7e54fe5b5ccd5d6624ea6255c3473be090b802e1"
+
 regenerator-transform@0.9.11:
   version "0.9.11"
   resolved "https://registry.yarnpkg.com/regenerator-transform/-/regenerator-transform-0.9.11.tgz#3a7d067520cb7b7176769eb5ff868691befe1283"
@@ -4657,6 +4758,14 @@ regenerator-transform@0.9.11:
     babel-types "^6.19.0"
     private "^0.1.6"
 
+regenerator-transform@^0.10.0:
+  version "0.10.1"
+  resolved "https://registry.yarnpkg.com/regenerator-transform/-/regenerator-transform-0.10.1.tgz#1e4996837231da8b7f3cf4114d71b5691a0680dd"
+  dependencies:
+    babel-runtime "^6.18.0"
+    babel-types "^6.19.0"
+    private "^0.1.6"
+
 regex-cache@^0.4.2:
   version "0.4.3"
   resolved "https://registry.yarnpkg.com/regex-cache/-/regex-cache-0.4.3.tgz#9b1a6c35d4d0dfcef5711ae651e8e9d3d7114145"
@@ -5395,7 +5504,7 @@ to-arraybuffer@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/to-arraybuffer/-/to-arraybuffer-1.0.1.tgz#7d229b1fcc637e466ca081180836a7aabff83f43"
 
-to-fast-properties@^1.0.1:
+to-fast-properties@^1.0.1, to-fast-properties@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-1.0.3.tgz#b83571fa4d8c25b82e231b06e3a3055de4ca1a47"