diff --git a/polyfill/index.d.ts b/polyfill/index.d.ts
index afcd0f01b..6a0b06a55 100644
--- a/polyfill/index.d.ts
+++ b/polyfill/index.d.ts
@@ -1176,7 +1176,6 @@ declare namespace Intl {
   type Formattable =
     | Date
     | Temporal.Instant
-    | Temporal.ZonedDateTime
     | Temporal.PlainDate
     | Temporal.PlainTime
     | Temporal.PlainDateTime