diff --git a/python/servo/package_commands.py b/python/servo/package_commands.py
index 6dd788f5fa4..76bcd439649 100644
--- a/python/servo/package_commands.py
+++ b/python/servo/package_commands.py
@@ -546,7 +546,7 @@ class PackageCommands(CommandBase):
         import boto3
 
         def get_taskcluster_secret(name):
-            url = "http://taskcluster/secrets/v1/secret/project/servo/" + name
+            url = os.environ["TASKCLUSTER_PROXY_URL"] "/secrets/v1/secret/project/servo/" + name
             return json.load(urllib.urlopen(url))["secret"]
 
         def get_s3_secret():