diff --git a/package-lock.json b/package-lock.json
index 3f17f04b..f623631d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1810,7 +1810,7 @@
         },
         "util": {
           "version": "0.10.3",
-          "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
+          "resolved": "http://registry.npmjs.org/util/-/util-0.10.3.tgz",
           "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
           "dev": true,
           "requires": {
@@ -2303,7 +2303,7 @@
     },
     "browserify-aes": {
       "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz",
+      "resolved": "http://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz",
       "integrity": "sha512-+7CHXqGuspUn/Sl5aO7Ea0xWGAtETPXNSAjHo48JfLdPWcMng33Xe4znFvQweqc/uzk5zSOI3H52CYnjCfb5hA==",
       "dev": true,
       "requires": {
@@ -2340,7 +2340,7 @@
     },
     "browserify-rsa": {
       "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.0.1.tgz",
+      "resolved": "http://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.0.1.tgz",
       "integrity": "sha1-IeCr+vbyApzy+vsTNWenAdQTVSQ=",
       "dev": true,
       "requires": {
@@ -2394,7 +2394,7 @@
     },
     "buffer": {
       "version": "4.9.1",
-      "resolved": "https://registry.npmjs.org/buffer/-/buffer-4.9.1.tgz",
+      "resolved": "http://registry.npmjs.org/buffer/-/buffer-4.9.1.tgz",
       "integrity": "sha1-bRu2AbB6TvztlwlBMgkwJ8lbwpg=",
       "dev": true,
       "requires": {
@@ -3414,7 +3414,7 @@
     },
     "create-hash": {
       "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/create-hash/-/create-hash-1.2.0.tgz",
+      "resolved": "http://registry.npmjs.org/create-hash/-/create-hash-1.2.0.tgz",
       "integrity": "sha512-z00bCGNHDG8mHAkP7CtT1qVu+bFQUPjYq/4Iv3C3kWjTFV10zIjfSoeqXo9Asws8gwSHDGj/hl2u4OGIjapeCg==",
       "dev": true,
       "requires": {
@@ -3427,7 +3427,7 @@
     },
     "create-hmac": {
       "version": "1.1.7",
-      "resolved": "https://registry.npmjs.org/create-hmac/-/create-hmac-1.1.7.tgz",
+      "resolved": "http://registry.npmjs.org/create-hmac/-/create-hmac-1.1.7.tgz",
       "integrity": "sha512-MJG9liiZ+ogc4TzUwuvbER1JRdgvUFSB5+VR/g5h82fGaIRWMWddtKBHi7/sVhfjQZ6SehlyhvQYrcYkaUIpLg==",
       "dev": true,
       "requires": {
@@ -4061,7 +4061,7 @@
     },
     "diffie-hellman": {
       "version": "5.0.3",
-      "resolved": "https://registry.npmjs.org/diffie-hellman/-/diffie-hellman-5.0.3.tgz",
+      "resolved": "http://registry.npmjs.org/diffie-hellman/-/diffie-hellman-5.0.3.tgz",
       "integrity": "sha512-kqag/Nl+f3GwyK25fhUMYj81BUOrZ9IuJsjIcDE5icNM9FJHAVm3VcUDxdLPoQtTuUylWm6ZIknYJwwaPxsUzg==",
       "dev": true,
       "requires": {
@@ -9557,7 +9557,7 @@
       "dependencies": {
         "minimist": {
           "version": "0.0.10",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.10.tgz",
+          "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.10.tgz",
           "integrity": "sha1-3j+YVD2/lggr5IrRoMfNqDYwHc8=",
           "dev": true
         },
@@ -9818,7 +9818,7 @@
     },
     "path-browserify": {
       "version": "0.0.0",
-      "resolved": "https://registry.npmjs.org/path-browserify/-/path-browserify-0.0.0.tgz",
+      "resolved": "http://registry.npmjs.org/path-browserify/-/path-browserify-0.0.0.tgz",
       "integrity": "sha1-oLhwcpquIUAFt9UDLsLLuw+0RRo=",
       "dev": true
     },
@@ -11027,7 +11027,7 @@
     },
     "sha.js": {
       "version": "2.4.11",
-      "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
+      "resolved": "http://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
       "integrity": "sha512-QMEp5B7cftE7APOjk5Y6xgrbWu+WkLVQwk8JNjZ8nKRciZaByEW6MubieAiToS7+dwvrjGhH8jRXz3MVd0AYqQ==",
       "dev": true,
       "requires": {
@@ -12161,7 +12161,7 @@
     },
     "tty-browserify": {
       "version": "0.0.0",
-      "resolved": "https://registry.npmjs.org/tty-browserify/-/tty-browserify-0.0.0.tgz",
+      "resolved": "http://registry.npmjs.org/tty-browserify/-/tty-browserify-0.0.0.tgz",
       "integrity": "sha1-oVe6QC2iTpv5V/mqadUk7tQpAaY=",
       "dev": true
     },
@@ -12557,7 +12557,7 @@
     },
     "vm-browserify": {
       "version": "0.0.4",
-      "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-0.0.4.tgz",
+      "resolved": "http://registry.npmjs.org/vm-browserify/-/vm-browserify-0.0.4.tgz",
       "integrity": "sha1-XX6kW7755Kb/ZflUOOCofDV9WnM=",
       "dev": true,
       "requires": {
diff --git a/src/index.js b/src/index.js
index c8c65499..0451484d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -120,7 +120,7 @@ class CssModuleFactory {
 }
 
 class MiniCssExtractPlugin {
-  constructor(options) {
+  constructor(options = {}) {
     this.options = Object.assign(
       {
         filename: DEFAULT_FILENAME,
diff --git a/test/cases/default-options/expected/main.css b/test/cases/default-options/expected/main.css
new file mode 100644
index 00000000..aea53e43
--- /dev/null
+++ b/test/cases/default-options/expected/main.css
@@ -0,0 +1,2 @@
+body { background: red; }
+
diff --git a/test/cases/default-options/index.js b/test/cases/default-options/index.js
new file mode 100644
index 00000000..aa3357bf
--- /dev/null
+++ b/test/cases/default-options/index.js
@@ -0,0 +1 @@
+import './style.css';
diff --git a/test/cases/default-options/style.css b/test/cases/default-options/style.css
new file mode 100644
index 00000000..31fc5b8a
--- /dev/null
+++ b/test/cases/default-options/style.css
@@ -0,0 +1 @@
+body { background: red; }
diff --git a/test/cases/default-options/webpack.config.js b/test/cases/default-options/webpack.config.js
new file mode 100644
index 00000000..2cfff88d
--- /dev/null
+++ b/test/cases/default-options/webpack.config.js
@@ -0,0 +1,14 @@
+import Self from '../../../src';
+
+module.exports = {
+  entry: './index.js',
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [Self.loader, 'css-loader'],
+      },
+    ],
+  },
+  plugins: [new Self()],
+};