diff --git a/src/lib/books/progress.ts b/src/lib/books/progress.ts
index 220e5f8..e02127c 100644
--- a/src/lib/books/progress.ts
+++ b/src/lib/books/progress.ts
@@ -1,5 +1,5 @@
 // Validation and maths for the reader's progress API (pure, unit tested).
-import { z } from 'zod';
+import * as z from 'zod';
 
 export const progressPayload = z.object({
 	fileId: z.number().int().positive().nullish(),
diff --git a/src/lib/server/books/notes.ts b/src/lib/server/books/notes.ts
index 40e293c..53219db 100644
--- a/src/lib/server/books/notes.ts
+++ b/src/lib/server/books/notes.ts
@@ -1,6 +1,6 @@
 // Highlights and notes (books.notes). A row with `highlight` is a highlight from the reader
 // (optionally with a note); a row with only `note` is a free-form note on the book.
-import { z } from 'zod';
+import * as z from 'zod';
 import { and, eq } from 'drizzle-orm';
 import { db } from '#lib/server/db/index.js';
 import { bookFiles, bookNotes, bookWorks } from '#lib/server/db/schema/index.js';