diff --git a/packages/hydrogen/src/cart/queries/cartNoteUpdateDefault.ts b/packages/hydrogen/src/cart/queries/cartNoteUpdateDefault.ts
index 7824dc6835..b4e1170d92 100644
--- a/packages/hydrogen/src/cart/queries/cartNoteUpdateDefault.ts
+++ b/packages/hydrogen/src/cart/queries/cartNoteUpdateDefault.ts
@@ -36,7 +36,7 @@ export const CART_NOTE_UPDATE_MUTATION = (
 ) => `#graphql
   mutation cartNoteUpdate(
     $cartId: ID!
-    $note: String
+    $note: String!
     $language: LanguageCode
     $country: CountryCode
   ) @inContext(country: $country, language: $language) {