diff --git a/endpoints/tags.py b/endpoints/tags.py
index 41a103975..7267d7b7e 100644
--- a/endpoints/tags.py
+++ b/endpoints/tags.py
@@ -39,7 +39,9 @@ def get_tag(namespace, repository, tag):
 
   if permission.can() or model.repository_is_public(namespace, repository):
     tag_image = model.get_tag_image(namespace, repository, tag)
-    response = make_response(tag_image.docker_image_id, 200)
+    resp = make_response('"%s"' % tag_image.docker_image_id)
+    resp.headers['Content-Type'] = 'application/json'
+    return resp
 
   abort(403)