diff --git a/scripts/setup/flush-memcached b/scripts/setup/flush-memcached
index 980045ca49..903c7bb281 100755
--- a/scripts/setup/flush-memcached
+++ b/scripts/setup/flush-memcached
@@ -15,4 +15,8 @@ from zproject import settings
 
 cache = settings.CACHES["default"]
 assert isinstance(cache, dict)  # for mypy
-bmemcached.Client((cache["LOCATION"],), **cache["OPTIONS"]).flush_all()
+client = bmemcached.Client((cache["LOCATION"],), **cache["OPTIONS"])
+try:
+    client.flush_all()
+finally:
+    client.disconnect_all()