diff --git a/indexes.json b/indexes.json
index e6f44b69..69b7ebcf 100644
--- a/indexes.json
+++ b/indexes.json
@@ -96,6 +96,13 @@
             "mailbox": 1,
             "idate": 1
         }
+    }, {
+        "name": "by_idate_newer",
+        "key": {
+            "mailbox": 1,
+            "idate": -1,
+            "_uid": -1
+        }
     }, {
         "name": "by_hdate",
         "key": {