diff --git a/server/export_zip.ts b/server/export_zip.ts
index 0e34827..7925bf2 100644
--- a/server/export_zip.ts
+++ b/server/export_zip.ts
@@ -1,6 +1,6 @@
 import { Uint8ArrayReader, ZipWriter } from "zipjs/index.js";
 import { EhDb, PMeta } from "../db.ts";
-import { addZero } from "../utils.ts";
+import { addZero, configureZipJs } from "../utils.ts";
 
 export function get_export_zip_response(gid: number, db: EhDb) {
     const gmeta = db.get_gmeta_by_gid(gid);
@@ -36,6 +36,7 @@ export function get_export_zip_response(gid: number, db: EhDb) {
             bn += s;
         },
     });
+    configureZipJs();
     const zip_writer = new ZipWriter(s);
     let zip_closed = false;
     let closed = false;
diff --git a/tasks/export_zip.ts b/tasks/export_zip.ts
index 4424d46..71c5668 100644
--- a/tasks/export_zip.ts
+++ b/tasks/export_zip.ts
@@ -1,7 +1,12 @@
 import { join } from "std/path/mod.ts";
 import { Uint8ArrayReader, ZipWriter } from "zipjs/index.js";
 import { EhDb } from "../db.ts";
-import { addZero, asyncForEach, filterFilename } from "../utils.ts";
+import {
+    addZero,
+    asyncForEach,
+    configureZipJs,
+    filterFilename,
+} from "../utils.ts";
 import { Config } from "../config.ts";
 import { Task, TaskExportZipProgress, TaskType } from "../task.ts";
 import { TaskManager } from "../task_manager.ts";
@@ -44,6 +49,7 @@ export async function export_zip(
         truncate: true,
     });
     try {
+        configureZipJs();
         const z = new ZipWriter(f.writable, {
             signal,
             level: 0,
diff --git a/utils.ts b/utils.ts
index a5033f7..a47daf9 100644
--- a/utils.ts
+++ b/utils.ts
@@ -1,6 +1,7 @@
 import { exists, existsSync } from "std/fs/exists.ts";
 import { extname } from "std/path/mod.ts";
 import { initParser } from "deno_dom/deno-dom-wasm-noinit.ts";
+import { configure } from "zipjs/index.js";
 
 export function sleep(time: number): Promise<undefined> {
     return new Promise((r) => {
@@ -143,3 +144,11 @@ export type DiscriminatedUnion<
         ? { [Q in keyof U]: U[Q] }
         : never;
 }[keyof T];
+
+let zipjs_configured = false;
+
+export function configureZipJs() {
+    if (zipjs_configured) return;
+    configure({useWebWorkers: false});
+    zipjs_configured = true;
+}