diff --git a/apps/web/src/lib/api/external/laskugeneraattori/actions.ts b/apps/web/src/lib/api/external/laskugeneraattori/actions.ts
index 50bd3fc5..ecae611b 100644
--- a/apps/web/src/lib/api/external/laskugeneraattori/actions.ts
+++ b/apps/web/src/lib/api/external/laskugeneraattori/actions.ts
@@ -79,7 +79,7 @@ export async function SaveAction(
   const data = new FormData();
   data.append("data", JSON.stringify(json));
   attachments.forEach((attachment) => {
-    data.append("attachments", attachment);
+    data.append("attachments", attachment, encodeURIComponent(attachment.name));
   });
 
   const res = await fetch(`${laskugeneraattoriBaseUrl}/invoices`, {