diff --git a/scripts/publish-packs.ts b/scripts/publish-packs.ts
index 13e2279..6e1af39 100644
--- a/scripts/publish-packs.ts
+++ b/scripts/publish-packs.ts
@@ -72,7 +72,7 @@ function measure(): { files: number; bytes: number; maps: number; indexSha: stri
   if (!existsSync(indexPath)) {
     throw new PublishError(`no packs at ${PACKS_DIR} — run: npm run pack:data`)
   }
-  const index = JSON.parse(readFileSync(indexPath, 'utf8')) as { entries?: unknown[] }
+  const index = JSON.parse(readFileSync(indexPath, 'utf8')) as { entries?: unknown[]; levels?: unknown[] }
   const indexSha = createHash('sha256').update(readFileSync(indexPath)).digest('hex')
   let files = 0
   let bytes = 0
@@ -87,7 +87,7 @@ function measure(): { files: number; bytes: number; maps: number; indexSha: stri
     }
   }
   walk(PACKS_DIR)
-  return { files, bytes, maps: index.entries?.length ?? 0, indexSha }
+  return { files, bytes, maps: index.levels?.length ?? index.entries?.length ?? 0, indexSha }
 }
 
 /**