diff --git a/packages/artifact/src/internal/upload-gzip.ts b/packages/artifact/src/internal/upload-gzip.ts
index 0675aa33..7c04a277 100644
--- a/packages/artifact/src/internal/upload-gzip.ts
+++ b/packages/artifact/src/internal/upload-gzip.ts
@@ -80,7 +80,7 @@ export async function createGZipFileInBuffer(
     const gzip = zlib.createGzip()
     inputStream.pipe(gzip)
     // read stream into buffer, using experimental async iterators see https://github.com/nodejs/readable-stream/issues/403#issuecomment-479069043
-    const chunks = []
+    const chunks: Uint8Array[] = []
     for await (const chunk of gzip) {
       chunks.push(chunk)
     }