diff --git a/packages/vite/src/node/server/middlewares/compression.ts b/packages/vite/src/node/server/middlewares/compression.ts
index 7a97044985ac0e..bafae7ef2023c6 100644
--- a/packages/vite/src/node/server/middlewares/compression.ts
+++ b/packages/vite/src/node/server/middlewares/compression.ts
@@ -13,7 +13,7 @@ const noop = () => {}
 const mimes = /text|javascript|\/json|xml/i
 const threshold = 1024
 const level = -1
-const brotli = false
+let brotli = false
 const gzip = true
 
 const getChunkSize = (chunk, enc) => (chunk ? Buffer.byteLength(chunk, enc) : 0)