diff --git a/glance/control/image_manager.yml b/glance/control/image_manager.yml
index 37b2ca0..27103a3 100644
--- a/glance/control/image_manager.yml
+++ b/glance/control/image_manager.yml
@@ -2,4 +2,4 @@
   glance:
     server:
       policy:
-        publicize_image: 'role:admin or role:image_manager'
+        publicize_image: ['role:admin', 'role:image_manager']