diff --git a/reversion_compare/admin.py b/reversion_compare/admin.py
index cbf62d1..b6ccde9 100644
--- a/reversion_compare/admin.py
+++ b/reversion_compare/admin.py
@@ -179,7 +179,7 @@ def get_many_to_something(self, ids, related_model, is_reverse=False):
                 for ver in reversion.get_for_object(o):
                     # An object can only be missing if it actually existed prior to this version
                     # Otherwise its a new item
-                    if ver.revision.date_created < version.revision.date_created:
+                    if ver.revision.date_created < old_revision.date_created:
                         true_missing_objects.append(o)
             missing_objects = true_missing_objects
             deleted = [d for d in reversion.get_deleted(related_model) if d.revision == old_revision]