diff --git a/docs/jss-api.md b/docs/jss-api.md
index 56a1e4958..19ab37987 100644
--- a/docs/jss-api.md
+++ b/docs/jss-api.md
@@ -279,11 +279,11 @@ import jss from 'jss'
 const styles = {
   container: {
     height: 200,
-    width: data => data.width
+    width: (data) => data.width
   },
   button: {
-    color: data => data.button.color,
-    padding: data => data.button.padding
+    color: (data) => data.button.color,
+    padding: (data) => data.button.padding
   }
 }
 
@@ -457,7 +457,7 @@ import {getDynamicStyles} from 'jss'
 const dynamicStyles = getDynamicStyles({
   button: {
     fontSize: 12,
-    color: data => data.color
+    color: (data) => data.color
   }
 })
 
diff --git a/packages/jss-plugin-rule-value-function/src/plugin-nested.test.js b/packages/jss-plugin-rule-value-function/src/plugin-nested.test.js
index f045ab483..4eb0940bf 100644
--- a/packages/jss-plugin-rule-value-function/src/plugin-nested.test.js
+++ b/packages/jss-plugin-rule-value-function/src/plugin-nested.test.js
@@ -5,7 +5,7 @@ import {getCss, getStyle, removeWhitespace, resetSheets} from '../../../tests/ut
 import pluginNested from '../../jss-plugin-nested'
 import pluginFunction from '.'
 
-const settings = {createGenerateId: () => rule => `${rule.key}-id`}
+const settings = {createGenerateId: () => (rule) => `${rule.key}-id`}
 
 describe('jss-plugin-rule-value-function: plugin-nested', () => {
   let jss
@@ -21,7 +21,7 @@ describe('jss-plugin-rule-value-function: plugin-nested', () => {
       sheet = jss
         .createStyleSheet(
           {
-            a: data => ({
+            a: (data) => ({
               color: data.color,
               '@media all': {
                 color: 'green'
@@ -61,7 +61,7 @@ describe('jss-plugin-rule-value-function: plugin-nested', () => {
           {
             a: {
               color: 'red',
-              '@media all': data => ({
+              '@media all': (data) => ({
                 color: data.color
               })
             }
diff --git a/packages/jss/src/DomRenderer.js b/packages/jss/src/DomRenderer.js
index bd07621c1..a8dd0effd 100644
--- a/packages/jss/src/DomRenderer.js
+++ b/packages/jss/src/DomRenderer.js
@@ -6,7 +6,7 @@ import toCssValue from './utils/toCssValue'
 /**
  * Cache the value from the first time a function is called.
  */
-const memoize = fn => {
+const memoize = (fn) => {
   let value
   return () => {
     if (!value) value = fn()
diff --git a/packages/react-jss/src/createUseStyles.test.js b/packages/react-jss/src/createUseStyles.test.js
index 5bc39b838..b2db928d8 100644
--- a/packages/react-jss/src/createUseStyles.test.js
+++ b/packages/react-jss/src/createUseStyles.test.js
@@ -27,7 +27,7 @@ describe('React-JSS: createUseStyles', () => {
     it('should pass theme from props priority', () => {
       const registry = new SheetsRegistry()
 
-      const styles = theme => ({
+      const styles = (theme) => ({
         button: {color: theme.exampleColor || 'green'}
       })
 
@@ -48,7 +48,7 @@ describe('React-JSS: createUseStyles', () => {
 
   describe('multiple components that share same hook', () => {
     const useStyles = createUseStyles({
-      item: props => ({
+      item: (props) => ({
         color: props.active ? 'red' : 'blue',
         '&:hover': {
           fontSize: 60
@@ -139,7 +139,7 @@ describe('React-JSS: createUseStyles', () => {
 
       const classes = []
 
-      const getClasses = currentClasses => {
+      const getClasses = (currentClasses) => {
         classes.push(currentClasses)
       }