diff --git a/formats/aci.py b/formats/aci.py
index 97be94a59..dc1029d68 100644
--- a/formats/aci.py
+++ b/formats/aci.py
@@ -85,7 +85,6 @@ class ACIImage(TarImageFormatter):
 
     return isolators
 
-
   @staticmethod
   def _get_docker_config_value(docker_config, key, default_value):
     # Try the key itself.
@@ -100,7 +99,6 @@ class ACIImage(TarImageFormatter):
 
     return default_value
 
-
   @staticmethod
   def _build_ports(docker_config):
     """ Builds the ports definitions for the ACI. """
@@ -143,7 +141,6 @@ class ACIImage(TarImageFormatter):
   def _build_volumes(docker_config):
     """ Builds the volumes definitions for the ACI. """
     volumes = []
-    names = set()
 
     def get_name(docker_volume_path):
       return "volume-%s" % ACIImage._ac_name(docker_volume_path)
@@ -159,7 +156,6 @@ class ACIImage(TarImageFormatter):
       })
     return volumes
 
-
   @staticmethod
   def _build_manifest(namespace, repository, tag, docker_layer_data, synthetic_image_id):
     """ Builds an ACI manifest from the docker layer data. """
@@ -186,18 +182,18 @@ class ACIImage(TarImageFormatter):
       "acVersion": "0.6.1",
       "name": '%s/%s/%s' % (hostname.lower(), namespace.lower(), repository.lower()),
       "labels": [
-          {
-              "name": "version",
-              "value": tag,
-          },
-          {
-              "name": "arch",
-              "value": docker_layer_data.get('architecture', 'amd64')
-          },
-          {
-              "name": "os",
-              "value": docker_layer_data.get('os', 'linux')
-          }
+        {
+          "name": "version",
+          "value": tag,
+        },
+        {
+          "name": "arch",
+          "value": docker_layer_data.get('architecture', 'amd64')
+        },
+        {
+          "name": "os",
+          "value": docker_layer_data.get('os', 'linux')
+        }
       ],
       "app": {
         "exec": exec_path,