diff --git a/harvester/proxy.py b/harvester/proxy.py
index ed5e5ce..d7b5c81 100644
--- a/harvester/proxy.py
+++ b/harvester/proxy.py
@@ -51,7 +51,6 @@ def fetch_all(urls, max_workers=8):
     with concurrent.futures.ThreadPoolExecutor(max_workers=max_workers) as executor:
         future_to_url = {executor.submit(fetch_list, url): url for url in urls}
         for future in concurrent.futures.as_completed(future_to_url):
-            url = future_to_url[future]
             try:
                 proxy_list = future.result()
                 for proxy in proxy_list: