diff --git a/__tests__/defineClass.test.js b/__tests__/defineClass.test.js
deleted file mode 100644
index cb8fe09b5..000000000
--- a/__tests__/defineClass.test.js
+++ /dev/null
@@ -1,27 +0,0 @@
-import c from '../src/util/collapseWhitespace'
-import defineClass from '../src/util/defineClass'
-
-/**
- * Tests
- */
-it('creates a proper single-word class with rules', () => {
-  let output = defineClass('flex', { display: 'flex' })
-  expect(c(output.toString())).toEqual(`.flex { display: flex }`)
-})
-
-it('does not modify the case of selector names', () => {
-  let output = defineClass('inlineBlock', { display: 'inline-block' })
-  expect(c(output.toString())).toEqual(`.inlineBlock { display: inline-block }`)
-})
-
-it('does not modify the case of property names', () => {
-  let output = defineClass('smooth', {
-    '-webkit-font-smoothing': 'antialiased',
-  })
-  expect(c(output.toString())).toEqual(`.smooth { -webkit-font-smoothing: antialiased }`)
-})
-
-it('escapes non-standard characters in selectors', () => {
-  let output = defineClass('w-1/4', { width: '25%' })
-  expect(c(output.toString())).toEqual(`.w-1\\/4 { width: 25% }`)
-})
diff --git a/__tests__/defineClasses.test.js b/__tests__/defineClasses.test.js
deleted file mode 100644
index 4c6087440..000000000
--- a/__tests__/defineClasses.test.js
+++ /dev/null
@@ -1,19 +0,0 @@
-import c from '../src/util/collapseWhitespace'
-import defineClasses from '../src/util/defineClasses'
-
-/**
- * Tests
- */
-it('it generates a set of helper classes from a config', () => {
-  let output = defineClasses({
-    flex: {
-      display: 'flex',
-    },
-    'inline-flex': {
-      display: 'inline-flex',
-    },
-  })
-  expect(output).toBeInstanceOf(Array)
-  expect(c(output[0].toString())).toEqual(`.flex { display: flex }`)
-  expect(c(output[1].toString())).toEqual(`.inline-flex { display: inline-flex }`)
-})
diff --git a/src/util/defineClass.js b/src/util/defineClass.js
deleted file mode 100644
index 8ccb3aa69..000000000
--- a/src/util/defineClass.js
+++ /dev/null
@@ -1,18 +0,0 @@
-import _ from 'lodash'
-import postcss from 'postcss'
-import escapeClassName from './escapeClassName'
-
-export default function(className, properties) {
-  const decls = _.map(properties, (value, property) => {
-    return postcss.decl({
-      prop: `${property}`,
-      value: `${value}`,
-    })
-  })
-
-  return postcss
-    .rule({
-      selector: `.${escapeClassName(className)}`,
-    })
-    .append(decls)
-}
diff --git a/src/util/defineClasses.js b/src/util/defineClasses.js
deleted file mode 100644
index 4f80aef30..000000000
--- a/src/util/defineClasses.js
+++ /dev/null
@@ -1,8 +0,0 @@
-import _ from 'lodash'
-import defineClass from './defineClass'
-
-export default function defineClasses(classes) {
-  return _.map(classes, (properties, className) => {
-    return defineClass(className, properties)
-  })
-}