diff --git a/src/build.js b/src/build.js
index 10ef371..5fd48c4 100644
--- a/src/build.js
+++ b/src/build.js
@@ -81,9 +81,9 @@ const f = async () => {
 
   const files = await readdir(publicPath)
   await Promise.all(files.map(async (file) => {
-    // cf pages limits file size to 26.2MB
+    // cloudflare pages limits file size to 25MB
     // compressed (br/gz) files are excluded
-    if (file.startsWith('phishing-filter') && file.endsWith('.rules')) {
+    if (process.env.CF_PAGES && file.startsWith('phishing-filter') && file.endsWith('.rules')) {
       await rm(join(publicPath, file))
     }
   }))