diff --git a/roles/robosignatory/files/robosignatory.production.py b/roles/robosignatory/files/robosignatory.production.py
index ae03dd4d2f..3dbeb84f31 100644
--- a/roles/robosignatory/files/robosignatory.production.py
+++ b/roles/robosignatory/files/robosignatory.production.py
@@ -102,11 +102,11 @@ config = {
         },
     },
 
-    'robosignatory.ostree_refs': [
+    'robosignatory.ostree_refs': {
         'fedora-atomic/25/x86_64/docker-host': {
             'directory': '/mnt/koji/compose/atomic/25/',
             'key': 'fedora-25',
             'ref_to': 'fedora-atomic/25/x86_64/docker-host'
         }
-    ]
+    }
 }