diff --git a/apps/backend/app/routers/reports.py b/apps/backend/app/routers/reports.py
index 5b80ab8e..80f3f954 100644
--- a/apps/backend/app/routers/reports.py
+++ b/apps/backend/app/routers/reports.py
@@ -9,6 +9,7 @@
 from pyaslreport import generate_report, get_bids_metadata
 from pyaslreport.enums import ModalityTypeValues
 from fastapi.responses import FileResponse
+from starlette.background import BackgroundTask
 from weasyprint import HTML
 from app.utils.report_template import render_report_html
 from app.utils.lib import default_serializer, save_upload, remove_dir
@@ -129,5 +130,10 @@ async def download_pdf(report_data: dict):
     with tempfile.NamedTemporaryFile(delete=False, suffix=".pdf") as tmp:
         HTML(string=html_content).write_pdf(tmp.name)
         tmp_path = tmp.name
-    return FileResponse(tmp_path, media_type="application/pdf", filename="report.pdf")
+    return FileResponse(
+        tmp_path,
+        media_type="application/pdf",
+        filename="report.pdf",
+        background=BackgroundTask(os.unlink, tmp_path)
+    )