diff --git a/docs/documentation/sitespeed.io/prepostscript/index.md b/docs/documentation/sitespeed.io/prepostscript/index.md
index 14dc1cf22..a4e613a1e 100644
--- a/docs/documentation/sitespeed.io/prepostscript/index.md
+++ b/docs/documentation/sitespeed.io/prepostscript/index.md
@@ -110,7 +110,7 @@ module.exports = {
           const loginForm = driver.findElement(By.name('userlogin'));
           driver.findElement(By.id('wpName1')).sendKeys(userName);
           driver.findElement(By.id('wpPassword1')).sendKeys(password);
-          var loginButton = driver.findElement(webdriver.By.id('wpLoginAttempt'));
+          const loginButton = driver.findElement(webdriver.By.id('wpLoginAttempt'));
           loginButton.click();
           // we wait for something on the page that verifies that we are logged in
           return driver.wait(until.elementLocated(By.id('pt-userpage')), 3000);