diff --git a/tox.ini b/tox.ini
index 969f21d443..3796a54641 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,6 +13,7 @@ commands = {posargs}
 [testenv:pep8]
 commands =
     python ./tools/process-templates.py
+    python ./network/endpoints/build_endpoint_map.py --check
     python ./tools/yaml-validate.py .
 
 [testenv:templates]