diff --git a/c3l_membership/views.py b/c3l_membership/views.py
--- a/c3l_membership/views.py
+++ b/c3l_membership/views.py
@@ -132,6 +132,9 @@ def index():
             voting=True if form.membership.data == "regular" else False,
             xml=xml_template.format(**xml_data),
         )
-        return render_pdf(HTML(string=html))
+        return render_pdf(
+            HTML(string=html),
+            download_filename=f"C3L_Membership_{form.username.data}.pdf",
+        )
 
     return render_template("index.html", form=form, crypto_error=False)