diff --git a/src/lib/es2021.intl.d.ts b/src/lib/es2021.intl.d.ts
index 5da7dbddc0e..2424dc404a1 100644
--- a/src/lib/es2021.intl.d.ts
+++ b/src/lib/es2021.intl.d.ts
@@ -5,7 +5,7 @@ declare namespace Intl {
         dateStyle?: "full" | "long" | "medium" | "short" | undefined;
         timeStyle?: "full" | "long" | "medium" | "short" | undefined;
         dayPeriod?: "narrow" | "short" | "long" | undefined;
-        fractionalSecondDigits?: 0 | 1 | 2 | 3 | undefined;
+        fractionalSecondDigits?: 1 | 2 | 3 | undefined;
     }
 
     interface DateTimeRangeFormatPart extends DateTimeFormatPart {
diff --git a/tests/lib/lib.d.ts b/tests/lib/lib.d.ts
index 7f5cbf72e72..f1a04e4f8f2 100644
--- a/tests/lib/lib.d.ts
+++ b/tests/lib/lib.d.ts
@@ -3956,7 +3956,7 @@ declare module Intl {
         hour?: "numeric" | "2-digit";
         minute?: "numeric" | "2-digit";
         second?: "numeric" | "2-digit";
-        fractionalSecondDigits?: 0 | 1 | 2 | 3;
+        fractionalSecondDigits?: 1 | 2 | 3;
         timeZoneName?: "long" | "short";
     }