diff --git a/test/testconfig.py b/test/testconfig.py
index 8e37113d6..aee1b902f 100644
--- a/test/testconfig.py
+++ b/test/testconfig.py
@@ -73,3 +73,5 @@ class TestConfig(DefaultConfig):
 
   INSTANCE_SERVICE_KEY_KID_LOCATION = 'test/data/test.kid'
   INSTANCE_SERVICE_KEY_LOCATION = 'test/data/test.pem'
+
+  PROMETHEUS_AGGREGATOR_URL = None