diff --git a/server.py b/server.py
index df02fc6..23d74cf 100644
--- a/server.py
+++ b/server.py
@@ -117,7 +117,7 @@ def renew():
     if req["data"]["owner_tx_data"]["address"] not in allowed_owners:
         return redirect("/?error=not_anyone")
 
-    return redirect("https://pay.hns.au/p/renew?amount=10&data={domain}&redirect=https://renew.hns.au")
+    return redirect(f"https://pay.hns.au/p/renew?amount=10&data={domain}&redirect=https://renew.hns.au")
 
 @app.route("/renew/<path:path>", methods=["POST"])
 def renew_path(path: str):