diff --git a/packages/types/surveys.ts b/packages/types/surveys.ts
index 22dcedff9b..80c59a6d1a 100644
--- a/packages/types/surveys.ts
+++ b/packages/types/surveys.ts
@@ -477,7 +477,7 @@ export const ZSurveyInput = z
     welcomeCard: ZSurveyWelcomeCard.optional(),
     questions: ZSurveyQuestions.optional(),
     thankYouCard: ZSurveyThankYouCard.optional(),
-    hiddenFields: ZSurveyHiddenFields,
+    hiddenFields: ZSurveyHiddenFields.optional(),
     delay: z.number().optional(),
     autoComplete: z.number().optional(),
     closeOnDate: z.date().optional(),