diff --git a/package.json b/package.json
index 9913880..1107c90 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "main": "src/index.js",
   "scripts": {
     "test": "nyc ava",
-    "lint": "snazzy",
+    "lint": "xo",
     "coverage": "nyc report --reporter=text-lcov | coveralls"
   },
   "repository": {
@@ -33,6 +33,6 @@
     "ava": "^0.17.0",
     "coveralls": "^2.11.15",
     "nyc": "^10.0.0",
-    "snazzy": "^5.0.0"
+    "xo": "^0.17.1"
   }
 }
diff --git a/src/index.js b/src/index.js
index 6b51323..a6bc649 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,19 +1,19 @@
-const addSeconds = require('date-fns/add_seconds')
+const addSeconds = require('date-fns/add_seconds');
 
-function expired (headers) {
-  const originDate = new Date(headers.date)
+function expired(headers) {
+	const originDate = new Date(headers.date);
 
   // Get max age ms
-  let maxAge = headers['cache-control'] && headers['cache-control'].match(/max-age=(\d+)/)
-  maxAge = parseInt(maxAge ? maxAge[1] : 0)
+	let maxAge = headers['cache-control'] && headers['cache-control'].match(/max-age=(\d+)/);
+	maxAge = parseInt(maxAge ? maxAge[1] : 0, 10);
 
   // Take current age into account
-  if (headers.age) {
-    maxAge -= headers.age
-  }
+	if (headers.age) {
+		maxAge -= headers.age;
+	}
 
   // Calculate expirey date
-  return addSeconds(new Date(originDate), maxAge)
+	return addSeconds(new Date(originDate), maxAge);
 }
 
-module.exports = expired
+module.exports = expired;
diff --git a/test/unit.js b/test/unit.js
index f6a952f..0c8f2bf 100644
--- a/test/unit.js
+++ b/test/unit.js
@@ -1,6 +1,6 @@
-import test from 'ava'
-import expired from '../'
+import test from 'ava';
+import expired from '../';
 
 test('expired is a function', t => {
-  t.is(typeof expired, 'function')
-})
+	t.is(typeof expired, 'function');
+});