diff --git a/src/infrastructure/diff/engine/PhabricatorInlineCommentAdjustmentEngine.php b/src/infrastructure/diff/engine/PhabricatorInlineCommentAdjustmentEngine.php
--- a/src/infrastructure/diff/engine/PhabricatorInlineCommentAdjustmentEngine.php
+++ b/src/infrastructure/diff/engine/PhabricatorInlineCommentAdjustmentEngine.php
@@ -141,9 +141,7 @@
       }
     }
 
-    // Find the smallest "new" changeset ID. We'll consider everything
-    // larger than this to be "newer", and everything smaller to be "older".
-    $first_new_id = min(mpull($new, 'getID'));
+    $new_id_map = mpull($new, null, 'getID');
 
     $results = array();
     foreach ($inlines as $inline) {
@@ -163,7 +161,7 @@
 
       $target_id = null;
 
-      if ($changeset_id >= $first_new_id) {
+      if (isset($new_id_map[$changeset_id])) {
         $name_map = $name_map_new;
         $is_new = true;
       } else {