diff --git a/scripts/build-table.ts b/scripts/build-table.ts
index 19e711b040..b8df21eb4d 100644
--- a/scripts/build-table.ts
+++ b/scripts/build-table.ts
@@ -2,7 +2,7 @@ import fs from 'fs/promises'
 import path from 'path'
 
 async function main() {
-  const threshold = process.env.THRESHOLD || 40
+  const threshold = Number(process.env.THRESHOLD) || 40
   let output: string
   const diffOutput = await fs.readFile(
     path.resolve(__dirname, '..', 'tmp/diff.txt'),