diff --git a/browser-entry.js b/browser-entry.js
deleted file mode 100644
index 8d8a2e6..0000000
--- a/browser-entry.js
+++ /dev/null
@@ -1,29 +0,0 @@
-import should from "./es6/should";
-import * as root from "root";
-
-var defaultProto = Object.prototype;
-var defaultProperty = "should";
-
-var _root = root;
-
-//Expose api via `Object#should`.
-try {
-  var prevShould = should.extend(defaultProperty, defaultProto);
-  should._prevShould = prevShould;
-
-  Object.defineProperty(_root, "should", {
-    enumerable: false,
-    configurable: true,
-    value: should
-  });
-} catch (e) {
-  //ignore errors
-}
-
-if (typeof define === "function" && define.amd) {
-  define([], function() {
-    return should;
-  });
-} else if (typeof module === "object" && module.exports) {
-  module.exports = should;
-}
diff --git a/index.js b/index.js
deleted file mode 100644
index cbf4c58..0000000
--- a/index.js
+++ /dev/null
@@ -1,20 +0,0 @@
-var should = require("./cjs/should");
-
-var defaultProto = Object.prototype;
-var defaultProperty = "should";
-
-//Expose api via `Object#should`.
-try {
-  var prevShould = should.extend(defaultProperty, defaultProto);
-  should._prevShould = prevShould;
-
-  Object.defineProperty(global, "should", {
-    enumerable: false,
-    configurable: true,
-    value: should
-  });
-} catch (e) {
-  //ignore errors
-}
-
-module.exports = should;
diff --git a/lib/index.js b/lib/index.js
new file mode 100644
index 0000000..fce6cff
--- /dev/null
+++ b/lib/index.js
@@ -0,0 +1,28 @@
+import should from "./should";
+
+var defaultProto = Object.prototype;
+var defaultProperty = "should";
+
+var freeGlobal = typeof global == "object" && global && global.Object === Object && global;
+
+/** Detect free variable `self`. */
+var freeSelf = typeof self == "object" && self && self.Object === Object && self;
+
+/** Used as a reference to the global object. */
+var root = freeGlobal || freeSelf || Function("return this")();
+
+//Expose api via `Object#should`.
+try {
+  var prevShould = should.extend(defaultProperty, defaultProto);
+  should._prevShould = prevShould;
+
+  Object.defineProperty(root, "should", {
+    enumerable: false,
+    configurable: true,
+    value: should
+  });
+} catch (e) {
+  //ignore errors
+}
+
+export default should;
diff --git a/lib/umd.js b/lib/umd.js
new file mode 100644
index 0000000..10f27a2
--- /dev/null
+++ b/lib/umd.js
@@ -0,0 +1,9 @@
+import should from "./index";
+
+if (typeof define === "function" && define.amd) {
+  define([], function() {
+    return should;
+  });
+} else if (typeof module === "object" && module.exports) {
+  module.exports = should;
+}
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index 4b18af8..0000000
--- a/package-lock.json
+++ /dev/null
@@ -1,6037 +0,0 @@
-{
-  "name": "should",
-  "version": "12.0.0",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
-    "abbrev": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
-      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
-      "dev": true
-    },
-    "accepts": {
-      "version": "1.2.13",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.2.13.tgz",
-      "integrity": "sha1-5fHzkoxtlf2WVYw27D2dDeSm7Oo=",
-      "dev": true,
-      "requires": {
-        "mime-types": "2.1.16",
-        "negotiator": "0.5.3"
-      }
-    },
-    "acorn": {
-      "version": "4.0.13",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-4.0.13.tgz",
-      "integrity": "sha1-EFSVrlNh1pe9GVyCUZLhrX8lN4c=",
-      "dev": true
-    },
-    "acorn-jsx": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
-      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
-      "dev": true,
-      "requires": {
-        "acorn": "3.3.0"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "3.3.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
-          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
-          "dev": true
-        }
-      }
-    },
-    "adm-zip": {
-      "version": "0.4.7",
-      "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.4.7.tgz",
-      "integrity": "sha1-hgbCy/HEJs6MjsABdER/1Jtur8E=",
-      "dev": true
-    },
-    "ajv": {
-      "version": "4.11.8",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
-      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
-      "dev": true,
-      "requires": {
-        "co": "4.6.0",
-        "json-stable-stringify": "1.0.1"
-      }
-    },
-    "ajv-keywords": {
-      "version": "1.5.1",
-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
-      "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
-      "dev": true
-    },
-    "align-text": {
-      "version": "0.1.4",
-      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
-      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
-      "dev": true,
-      "requires": {
-        "kind-of": "3.2.2",
-        "longest": "1.0.1",
-        "repeat-string": "1.6.1"
-      }
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-    "amdefine": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
-      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true
-    },
-    "ansi-escapes": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
-      "integrity": "sha1-06ioOzGapneTZisT52HHkRQiMG4=",
-      "dev": true
-    },
-    "ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-      "dev": true
-    },
-    "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-      "dev": true
-    },
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-      "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
-      "dev": true,
-      "requires": {
-        "micromatch": "2.3.11",
-        "normalize-path": "2.1.1"
-      },
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-          "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-2.3.11.tgz",
-          "integrity": "sha1-hmd8l9FyCzY0MdBNDRUpO9OMFWU=",
-          "dev": true,
-          "requires": {
-            "arr-diff": "2.0.0",
-            "array-unique": "0.2.1",
-            "braces": "1.8.5",
-            "expand-brackets": "0.1.5",
-            "extglob": "0.3.2",
-            "filename-regex": "2.0.1",
-            "is-extglob": "1.0.0",
-            "is-glob": "2.0.1",
-            "kind-of": "3.2.2",
-            "normalize-path": "2.1.1",
-            "object.omit": "2.0.1",
-            "parse-glob": "3.0.4",
-            "regex-cache": "0.4.3"
-          }
-        }
-      }
-    },
-    "archiver": {
-      "version": "0.7.1",
-      "resolved": "https://registry.npmjs.org/archiver/-/archiver-0.7.1.tgz",
-      "integrity": "sha1-zxUteU+Gu9k/mFjaYNNqrqutm78=",
-      "dev": true,
-      "requires": {
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-          "dev": true
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-          "integrity": "sha1-GyXWPHcqTCDwpe0KnXf0hLbhaSA=",
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-          "dev": true
-        },
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-          "version": "1.0.34",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
-          "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=",
-          "dev": true,
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-            "isarray": "0.0.1",
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diff --git a/package.json b/package.json
index aeccbb7..01517c2 100644
--- a/package.json
+++ b/package.json
@@ -9,14 +9,14 @@
   },
   "homepage": "https://github.com/shouldjs/should.js",
   "scripts": {
-    "cjs": "rollup --output.format=cjs --output.file=cjs/should.js lib/should.js",
-    "es6": "rollup --output.format=es --output.file=es6/should.js lib/should.js",
+    "cjs": "rollup --output.format=cjs --output.file=cjs/should.js lib/index.js",
+    "es6": "rollup --output.format=es --output.file=es6/should.js lib/index.js",
     "build": "npm run cjs && npm run es6",
     "prepare": "npm run build && npm run browser",
     "pretest": "npm run build",
     "test": "mocha -R mocha-better-spec-reporter --color --check-leaks ./test/*.test.js ./test/**/*.test.js",
     "zuul": "zuul -- ./test/**/*.test.js ./test/*.test.js",
-    "browser": "rollup -c rollup.config.js --output.format=iife  --output.file ./should.js"
+    "browser": "rollup -c rollup.config.js --input ./lib/umd.js --output.format=iife  --output.file ./should.js"
   },
   "devDependencies": {
     "bluebird": "^3.5.0",
diff --git a/rollup.config.js b/rollup.config.js
index e3780b1..e022e4f 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -15,7 +15,6 @@ const banner = `/*!
 `;
 
 module.exports = {
-  input: "browser-entry.js",
   banner,
   plugins: [
     nodeResolve({
@@ -24,9 +23,5 @@ module.exports = {
       main: true,
       preferBuiltins: false
     })
-  ],
-  external: ["root"],
-  globals: {
-    root: "this"
-  }
+  ]
 };