diff --git a/index.js b/index.js
index 82f1acff..b216c187 100644
--- a/index.js
+++ b/index.js
@@ -289,7 +289,7 @@ ExtractTextPlugin.prototype.apply = function(compiler) {
 			extractedChunks.forEach(function(extractedChunk) {
 				if(extractedChunk.modules.length) {
 					extractedChunk.modules.sort(function(a, b) {
-						if(isInvalidOrder(a, b)) {
+						if(!options.ignoreOrder && isInvalidOrder(a, b)) {
 							compilation.errors.push(new OrderUndefinedError(a.getOriginalModule()));
 							compilation.errors.push(new OrderUndefinedError(b.getOriginalModule()));
 						}
diff --git a/test/cases/order-undefined-error/a.css b/test/cases/order-undefined-error/a.css
new file mode 100644
index 00000000..8abd6bfb
--- /dev/null
+++ b/test/cases/order-undefined-error/a.css
@@ -0,0 +1,4 @@
+.a {
+  composes: c1 from './c1.css';
+  composes: c2 from './c2.css';
+}
diff --git a/test/cases/order-undefined-error/b.css b/test/cases/order-undefined-error/b.css
new file mode 100644
index 00000000..bbc901f7
--- /dev/null
+++ b/test/cases/order-undefined-error/b.css
@@ -0,0 +1,4 @@
+.b {
+  composes: c2 from './c2.css';
+  composes: c1 from './c1.css';
+}
diff --git a/test/cases/order-undefined-error/c1.css b/test/cases/order-undefined-error/c1.css
new file mode 100644
index 00000000..af144e72
--- /dev/null
+++ b/test/cases/order-undefined-error/c1.css
@@ -0,0 +1,2 @@
+.c1 {
+}
diff --git a/test/cases/order-undefined-error/c2.css b/test/cases/order-undefined-error/c2.css
new file mode 100644
index 00000000..f9e9e192
--- /dev/null
+++ b/test/cases/order-undefined-error/c2.css
@@ -0,0 +1,2 @@
+.c2 {
+}
diff --git a/test/cases/order-undefined-error/expected/file.css b/test/cases/order-undefined-error/expected/file.css
new file mode 100644
index 00000000..b87b58bd
--- /dev/null
+++ b/test/cases/order-undefined-error/expected/file.css
@@ -0,0 +1,8 @@
+._3QiTkN7JPds2C9Bq73MpOX {
+}
+._3dtwYD12yqGZUJ-uPQLu9z {
+}
+._32HVXkGocfWZMaHoXEFkED {
+}
+.hbZI7DlQBB9VYNCgL20kL {
+}
diff --git a/test/cases/order-undefined-error/index.js b/test/cases/order-undefined-error/index.js
new file mode 100644
index 00000000..a2a7578a
--- /dev/null
+++ b/test/cases/order-undefined-error/index.js
@@ -0,0 +1,2 @@
+require('./a.css');
+require('./b.css');
diff --git a/test/cases/order-undefined-error/webpack.config.js b/test/cases/order-undefined-error/webpack.config.js
new file mode 100644
index 00000000..c86c7b28
--- /dev/null
+++ b/test/cases/order-undefined-error/webpack.config.js
@@ -0,0 +1,15 @@
+var ExtractTextPlugin = require("../../../");
+module.exports = {
+  entry: "./index.js",
+  module: {
+    loaders: [{
+      test: /\.css$/,
+      loader: ExtractTextPlugin.extract('style', 'css?modules')
+    }]
+  },
+  plugins: [
+    new ExtractTextPlugin('file.css', {
+      ignoreOrder: true
+    })
+  ]
+}