diff --git a/ts/textsecure/WebAPI.preload.ts b/ts/textsecure/WebAPI.preload.ts
index 25d6f9a216..eaf3ca5040 100644
--- a/ts/textsecure/WebAPI.preload.ts
+++ b/ts/textsecure/WebAPI.preload.ts
@@ -1099,7 +1099,7 @@ export type CreateAccountOptionsType = Readonly<{
 
 const linkDeviceResultZod = z.object({
   uuid: aciSchema,
-  pni: untaggedPniSchema.optional(),
+  pni: untaggedPniSchema.nullish(),
   deviceId: z.number(),
 });
 export type LinkDeviceResultType = z.infer<typeof linkDeviceResultZod>;