diff --git a/packages/react-scripts/config/env.js b/packages/react-scripts/config/env.js
index b9dc2da7b5c..82400688c94 100644
--- a/packages/react-scripts/config/env.js
+++ b/packages/react-scripts/config/env.js
@@ -15,7 +15,7 @@
 var REACT_APP = /^REACT_APP_/i;
 
 function getClientEnvironment(publicUrl) {
-  var vars = Object
+  var raw = Object
     .keys(process.env)
     .filter(key => REACT_APP.test(key))
     .reduce((env, key) => {
@@ -32,18 +32,18 @@ function getClientEnvironment(publicUrl) {
       'PUBLIC_URL': publicUrl
     });
   // Stringify all values so we can feed into Webpack DefinePlugin
-  var string = {
+  var stringified = {
     'process.env': Object
-      .keys(vars)
+      .keys(raw)
       .reduce((env, key) => {
-        env[key] = JSON.stringify(vars[key]);
+        env[key] = JSON.stringify(raw[key]);
         return env;
       }, {}),
   };
 
   return {
-    vars: vars,
-    string: string,
+    raw: raw,
+    stringified: stringified,
   };
 }
 
diff --git a/packages/react-scripts/config/webpack.config.dev.js b/packages/react-scripts/config/webpack.config.dev.js
index 7f3b26202e8..cbac62595b1 100644
--- a/packages/react-scripts/config/webpack.config.dev.js
+++ b/packages/react-scripts/config/webpack.config.dev.js
@@ -206,7 +206,7 @@ module.exports = {
     // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
     // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
     // In development, this will be an empty string.
-    new InterpolateHtmlPlugin(env.vars),
+    new InterpolateHtmlPlugin(env.raw),
     // Generates an `index.html` file with the <script> injected.
     new HtmlWebpackPlugin({
       inject: true,
@@ -214,7 +214,7 @@ module.exports = {
     }),
     // Makes some environment variables available to the JS code, for example:
     // if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
-    new webpack.DefinePlugin(env.string),
+    new webpack.DefinePlugin(env.stringified),
     // This is necessary to emit hot updates (currently CSS only):
     new webpack.HotModuleReplacementPlugin(),
     // Watcher doesn't work well if you mistype casing in a path so we use
diff --git a/packages/react-scripts/config/webpack.config.prod.js b/packages/react-scripts/config/webpack.config.prod.js
index 39246128cd2..544231bac34 100644
--- a/packages/react-scripts/config/webpack.config.prod.js
+++ b/packages/react-scripts/config/webpack.config.prod.js
@@ -54,7 +54,7 @@ var env = getClientEnvironment(publicUrl);
 
 // Assert this just to be safe.
 // Development builds of React are slow and not intended for production.
-if (env.string['process.env'].NODE_ENV !== '"production"') {
+if (env.stringified['process.env'].NODE_ENV !== '"production"') {
   throw new Error('Production builds must have NODE_ENV=production.');
 }
 
@@ -219,7 +219,7 @@ module.exports = {
     // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
     // In production, it will be an empty string unless you specify "homepage"
     // in `package.json`, in which case it will be the pathname of that URL.
-    new InterpolateHtmlPlugin(env.vars),
+    new InterpolateHtmlPlugin(env.raw),
     // Generates an `index.html` file with the <script> injected.
     new HtmlWebpackPlugin({
       inject: true,
@@ -241,7 +241,7 @@ module.exports = {
     // if (process.env.NODE_ENV === 'production') { ... }. See `./env.js`.
     // It is absolutely essential that NODE_ENV was set to production here.
     // Otherwise React will be compiled in the very slow development mode.
-    new webpack.DefinePlugin(env.string),
+    new webpack.DefinePlugin(env.stringified),
     // This helps ensure the builds are consistent if source hasn't changed:
     new webpack.optimize.OccurrenceOrderPlugin(),
     // Try to dedupe duplicated modules, if any: