diff --git a/formats/aci.py b/formats/aci.py
index 4435acbaf..31a0d14a6 100644
--- a/formats/aci.py
+++ b/formats/aci.py
@@ -128,7 +128,7 @@ class ACIImage(TarImageFormatter):
 
         name = '/' + name
 
-      return name
+      return name.lower()
 
     for docker_volume_path in docker_config.get('volumes', {}):
       volumes.append({
@@ -163,7 +163,7 @@ class ACIImage(TarImageFormatter):
     manifest = {
       "acKind": "ImageManifest",
       "acVersion": "0.6.1",
-      "name": '%s/%s/%s/' % (hostname, namespace, repository),
+      "name": '%s/%s/%s' % (hostname.lower(), namespace.lower(), repository.lower()),
       "labels": [
           {
               "name": "version",