diff --git a/app/utils/han-number.ts b/app/utils/han-number.ts
index 8104aed..d021285 100644
--- a/app/utils/han-number.ts
+++ b/app/utils/han-number.ts
@@ -4,9 +4,11 @@
  * Every interface language here is written in Han script and spells these the
  * same way, so the numeral is a formatting detail rather than a message of its
  * own: 三地同形 reads in Chinese exactly as 三つの字形 reads in Japanese.
- * Anything past the handful of columns a row can have falls back to figures.
  */
-const HAN_DIGITS = ['〇', '一', '二', '三', '四', '五']
+const hanNumberFormat = new Intl.NumberFormat('zh', {
+  numberingSystem: 'hanidec',
+  useGrouping: false,
+})
 
 export const hanNumber = (value: number): string =>
-  HAN_DIGITS[value] ?? String(value)
+  hanNumberFormat.format(value)