diff --git a/frontend/src/services/pdfExportService.ts b/frontend/src/services/pdfExportService.ts
index fe3e314e0..c0d6929fd 100644
--- a/frontend/src/services/pdfExportService.ts
+++ b/frontend/src/services/pdfExportService.ts
@@ -130,7 +130,7 @@ export class PDFExportService {
     newDoc.setModificationDate(new Date());
 
     const pdfBytes = await newDoc.save();
-    return new Blob([pdfBytes], { type: 'application/pdf' });
+    return new Blob([pdfBytes as BlobPart], { type: 'application/pdf' });
   }
 
   /**
@@ -176,7 +176,7 @@ export class PDFExportService {
     newDoc.setModificationDate(new Date());
 
     const pdfBytes = await newDoc.save();
-    return new Blob([pdfBytes], { type: 'application/pdf' });
+    return new Blob([pdfBytes as BlobPart], { type: 'application/pdf' });
   }