diff --git a/packages/core/src/types.ts b/packages/core/src/types.ts
index 106c79610..59922cd6a 100644
--- a/packages/core/src/types.ts
+++ b/packages/core/src/types.ts
@@ -11,6 +11,7 @@ export type ErrorBag = Record<string, Errors>
 
 export type FormDataConvertible =
   | Array<FormDataConvertible>
+  | { [key: string]: FormDataConvertible }
   | Blob
   | FormDataEntryValue
   | Date