diff --git a/__tests__/mergeConfig.test.js b/__tests__/mergeConfig.test.js
deleted file mode 100644
index 3592129d7..000000000
--- a/__tests__/mergeConfig.test.js
+++ /dev/null
@@ -1,83 +0,0 @@
-import mergeConfig from '../src/util/mergeConfig'
-
-/**
- * Tests
- */
-it('replaces simple top level keys', () => {
-  const defaultConfig = {
-    colors: {
-      'red': '#f25451',
-      'green-light': '#b1f3be',
-      'blue-dark': '#3687c8',
-      'indigo': '#6574cd',
-    }
-  }
-  const userConfig = {
-    colors: {
-      'orange': '#ffb82b',
-      'green': '#57d06f',
-      'blue': '#4aa2ea',
-      'indigo-dark': '#4957a5',
-    }
-  }
-  expect(mergeConfig(defaultConfig, userConfig)).toMatchObject(userConfig)
-})
-
-it('merges keys found in the "extend" section', () => {
-  const defaultConfig = {
-    colors: {
-      'red': '#f25451',
-    },
-    text: {
-      sizes: {
-        'base': '1rem',
-        'lg': '1.25rem',
-      }
-    },
-    spacing: {
-      padding: {
-        '0': '0',
-        '1': '0.25rem',
-        '2': '0.5rem',
-      }
-    }
-  }
-  const userConfig = {
-    extend: {
-      colors: {
-        'blue': '#4aa2ea',
-      },
-      text: {
-        sizes: {
-          'xl': '1.5rem'
-        }
-      },
-      spacing: {
-        padding: {
-          '10': '2.5rem'
-        }
-      }
-    }
-  }
-  expect(mergeConfig(defaultConfig, userConfig)).toMatchObject({
-    colors: {
-      'red': '#f25451',
-      'blue': '#4aa2ea',
-    },
-    text: {
-      sizes: {
-        'base': '1rem',
-        'lg': '1.25rem',
-        'xl': '1.5rem',
-      }
-    },
-    spacing: {
-      padding: {
-        '0': '0',
-        '1': '0.25rem',
-        '2': '0.5rem',
-        '10': '2.5rem',
-      }
-    }
-  })
-})
diff --git a/src/build.js b/src/build.js
index 1d0d8f5e9..f6723070b 100644
--- a/src/build.js
+++ b/src/build.js
@@ -1,13 +1,12 @@
 import fs from 'fs'
 import postcss from 'postcss'
 import tailwind from '..'
-import defaultConfig from '../defaultConfig'
 import CleanCSS from 'clean-css'
 
 console.info('Building Tailwind!')
 
 fs.readFile('./css/tailwind.css', (err, css) => {
-  postcss([tailwind(defaultConfig)])
+  postcss([tailwind()])
     .process(css, {
       from: './css/tailwind.css',
       to: './dist/tailwind.css',
diff --git a/src/index.js b/src/index.js
index 22a3e6081..55881e16c 100644
--- a/src/index.js
+++ b/src/index.js
@@ -6,7 +6,6 @@ import postcss from 'postcss'
 import stylefmt from 'stylefmt'
 
 import defaultConfig from '../defaultConfig'
-import mergeConfig from './util/mergeConfig'
 
 import substituteResetAtRule from './lib/substituteResetAtRule'
 import evaluateTailwindFunctions from './lib/evaluateTailwindFunctions'
@@ -17,13 +16,11 @@ import substituteResponsiveAtRules from './lib/substituteResponsiveAtRules'
 import substituteScreenAtRules from './lib/substituteScreenAtRules'
 import substituteClassApplyAtRules from './lib/substituteClassApplyAtRules'
 
-const plugin = postcss.plugin('tailwind', (options = {}) => {
-  if (_.isString(options)) {
-    options = require(path.resolve(options))
+const plugin = postcss.plugin('tailwind', (config = defaultConfig) => {
+  if (_.isString(config)) {
+    config = require(path.resolve(config))
   }
 
-  const config = mergeConfig(defaultConfig, options)
-
   return postcss([
     substituteResetAtRule(config),
     evaluateTailwindFunctions(config),
diff --git a/src/util/mergeConfig.js b/src/util/mergeConfig.js
deleted file mode 100644
index e83ea5310..000000000
--- a/src/util/mergeConfig.js
+++ /dev/null
@@ -1,65 +0,0 @@
-import _ from 'lodash'
-
-const configTemplate = {
-  screens: null,
-  colors: null,
-  text: {
-    fonts: null,
-    sizes: null,
-    weights: null,
-    leading: null,
-    tracking: null,
-    colors: null,
-  },
-  backgrounds: {
-    colors: null,
-  },
-  borders: {
-    widths: null,
-    colors: null,
-  },
-  radiuses: null,
-  sizing: {
-    width: null,
-    height: null,
-    minHeight: null,
-    maxHeight: null,
-    minWidth: null,
-    maxWidth: null,
-  },
-  spacing: {
-    padding: null,
-    margin: null,
-    negativeMargin: null,
-  },
-  shadows: null,
-  zIndex: null,
-  opacity: null,
-}
-
-function replaceDefaults(template, defaults, replacements) {
-  return Object.keys(template).reduce((merged, key) => {
-    const value = template[key]
-
-    if (_.isPlainObject(value)) {
-      merged[key] = replaceDefaults(value, _.get(defaults, key), _.get(replacements, key))
-    } else {
-      merged[key] = _.get(replacements, key, _.get(defaults, key))
-    }
-
-    return merged
-  }, {})
-}
-
-function appendConfig(base, appends) {
-  return _.mergeWith({}, base, appends, (baseValue, appendsValue) => {
-    if (_.isArray(baseValue)) {
-      return baseValue.concat(appendsValue);
-    }
-  })
-}
-
-export default function mergeConfig(base, other) {
-  const replaced = replaceDefaults(configTemplate, base, other)
-  return appendConfig(replaced, _.get(other, 'extend', {}))
-}