diff --git a/docker/configure_workers_and_start.py b/docker/configure_workers_and_start.py
index 6d73e8feaa..ff5cff3221 100755
--- a/docker/configure_workers_and_start.py
+++ b/docker/configure_workers_and_start.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/local/bin/python
 #
 # This file is licensed under the Affero General Public License (AGPL) version 3.
 #
@@ -604,7 +604,7 @@ def generate_base_homeserver_config() -> None:
     # start.py already does this for us, so just call that.
     # note that this script is copied in in the official, monolith dockerfile
     os.environ["SYNAPSE_HTTP_PORT"] = str(MAIN_PROCESS_HTTP_LISTENER_PORT)
-    subprocess.run(["/usr/local/bin/python", "/start.py", "migrate_config"], check=True)
+    subprocess.run([sys.executable, "/start.py", "migrate_config"], check=True)
 
 
 def parse_worker_types(