diff --git a/perf-measures/bundle-check/scripts/check-bundle-size.ts b/perf-measures/bundle-check/scripts/check-bundle-size.ts
index 050d061b..84843a94 100644
--- a/perf-measures/bundle-check/scripts/check-bundle-size.ts
+++ b/perf-measures/bundle-check/scripts/check-bundle-size.ts
@@ -30,7 +30,7 @@ async function main() {
     metrics.push({
       key: 'bundle-size-kb',
       name: 'Bundle Size (KB)',
-      value: (bundleSize / 1024).toFixed(2),
+      value: (bundleSize / 1024).toFixed(2).toString(),
       unit: 'KB',
     })