diff --git a/scripts/test_urls.py b/scripts/test_urls.py
index 6abedea71f6c46c8f8437ad42e12666946789f3e..41f6a02c61bfe89e29eef40e152d95c0c7e8aa3f 100755
--- a/scripts/test_urls.py
+++ b/scripts/test_urls.py
@@ -85,7 +85,7 @@ headers={
     }
 
 session = requests.Session()
-adapter = requests.adapters.HTTPAdapter(max_retries=3)
+adapter = requests.adapters.HTTPAdapter(max_retries=3, pool_block=True)
 session.mount('http://', adapter)
 session.mount('https://', adapter)