diff --git a/packages/@internationalized/date/src/DateFormatter.ts b/packages/@internationalized/date/src/DateFormatter.ts
index 16d808864d3..7767a2d31b7 100644
--- a/packages/@internationalized/date/src/DateFormatter.ts
+++ b/packages/@internationalized/date/src/DateFormatter.ts
@@ -13,7 +13,7 @@
 let formatterCache = new Map<string, Intl.DateTimeFormat>();
 
 interface ResolvedDateTimeFormatOptions extends Intl.ResolvedDateTimeFormatOptions {
-  hourCycle?: Intl.DateTimeFormatOptions['hourCycle']
+  hourCycle?: NonNullable<Intl.DateTimeFormatOptions['hourCycle']>
 }
 
 interface DateRangeFormatPart extends Intl.DateTimeFormatPart {
diff --git a/packages/@react-types/shared/src/dom.d.ts b/packages/@react-types/shared/src/dom.d.ts
index 88fea2c1c13..d0d3fe03e5e 100644
--- a/packages/@react-types/shared/src/dom.d.ts
+++ b/packages/@react-types/shared/src/dom.d.ts
@@ -59,7 +59,7 @@ export interface DOMProps {
   /**
    * The element's unique identifier. See [MDN](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/id).
    */
-  id?: string
+  id?: string | undefined
 }
 
 export interface FocusableDOMProps extends DOMProps {