diff --git a/nodepool/builder.py b/nodepool/builder.py
index 65f35226f..26cfc5782 100644
--- a/nodepool/builder.py
+++ b/nodepool/builder.py
@@ -82,7 +82,7 @@ class DibImageFile(object):
             if image_file.is_file():
                 image = DibImageFile.from_path(image_file)
                 if image.image_id == image_id:
-                        images.append(image)
+                    images.append(image)
         return images
 
     @staticmethod
diff --git a/tox.ini b/tox.ini
index 6bdb91193..4cd653041 100644
--- a/tox.ini
+++ b/tox.ini
@@ -63,6 +63,6 @@ commands = stestr --test-path ./nodepool/tests/functional/openshift run --no-sub
 [flake8]
 # These are ignored intentionally in zuul projects;
 # please don't submit patches that solely correct them or enable them.
-ignore = E124,E125,E129,E402,H,W503
+ignore = E124,E125,E129,E402,E741,H,W503,W504
 show-source = True
 exclude = .venv,.tox,dist,doc,build,*.egg