diff --git a/src/lib/esnext.intl.d.ts b/src/lib/esnext.intl.d.ts
index bca52717b8fec..3194d378d7465 100644
--- a/src/lib/esnext.intl.d.ts
+++ b/src/lib/esnext.intl.d.ts
@@ -87,5 +87,11 @@ declare namespace Intl {
          * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/getWeekInfo#weekend)
          */
         weekend: number[];
+        /**
+         * An integer between 1 and 7 indicating the minimum number of days in the first week of a year or month for this locale.
+          *
+           * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/getWeekInfo#minimaldays)
+            */
+        minimalDays: number;
     }
 }