diff --git a/lib/db/tables.js b/lib/db/tables.js
index 67faaded..61679896 100644
--- a/lib/db/tables.js
+++ b/lib/db/tables.js
@@ -18,8 +18,10 @@ module.exports = {
     primaryKey: 'password'
   , indexes: {
       response: null
-    , responsePerDevice: function(row) {
-        return [row('response'), row('deviceId')]
+    , responsePerDevice: {
+        indexFunction: function(row) {
+          return [row('response'), row('deviceId')]
+        }
       }
     }
   }