diff --git a/test/index.js b/test/index.js
index ba583ebe..c3bf9340 100644
--- a/test/index.js
+++ b/test/index.js
@@ -15,8 +15,8 @@ test(async t => {
 
 test(async t => {
   const html = await render('/css')
-  t.true(html.includes('.css-im3wl1'))
-  t.true(html.includes('<div class="css-im3wl1">This is red</div>'))
+  t.regex(html, /\.css-\w+/)
+  t.regex(html, /<div class="css-\w+">This is red<\/div>/)
 })
 
 test(async t => {