diff --git a/src/service-worker.js b/src/service-worker.js
index a3e1e1c..9d2ac9d 100644
--- a/src/service-worker.js
+++ b/src/service-worker.js
@@ -4,7 +4,7 @@ const ASSETS = `cache${timestamp}`;
 
 // `shell` is an array of all the files generated by webpack,
 // `files` is an array of everything in the `static` directory
-const to_cache = shell.concat(assets);
+const to_cache = shell.concat(ASSETS);
 const cached = new Set(to_cache);
 
 self.addEventListener('install', event => {