diff --git a/api/image/index.js b/api/image/index.js
index 268a1d4..0615c69 100755
--- a/api/image/index.js
+++ b/api/image/index.js
@@ -4,6 +4,8 @@ const { json, send } = require('micro')
 const chrome = require('chrome-aws-lambda')
 const puppeteer = require('puppeteer-core')
 
+const { EXPORT_SIZES_HASH } = require('../../lib/constants')
+
 // TODO expose local version of dom-to-image
 const DOM_TO_IMAGE_URL = 'https://unpkg.com/dom-to-image@2.6.0/dist/dom-to-image.min.js'
 const NOTO_COLOR_EMOJI_URL =
@@ -60,13 +62,9 @@ module.exports = async (req, res) => {
     const dataUrl = await page.evaluate((target = document) => {
       const query = new URLSearchParams(document.location.search)
 
-      const EXPORT_SIZES_HASH = {
-        '1x': '1',
-        '2x': '2',
-        '4x': '4',
-      }
-
-      const exportSize = EXPORT_SIZES_HASH[query.get('es')] || '2'
+      const exportSize = EXPORT_SIZES_HASH[query.get('es')]
+        ? EXPORT_SIZES_HASH[query.get('es')].value
+        : 2
 
       target.querySelectorAll('span[role="presentation"]').forEach(node => {
         if (node.innerText && node.innerText.match(/%[A-Fa-f0-9]{2}/)) {