diff --git a/apps/explorer/lib/explorer/chain/import.ex b/apps/explorer/lib/explorer/chain/import.ex
index cc1e99e16b..2704fa4157 100644
--- a/apps/explorer/lib/explorer/chain/import.ex
+++ b/apps/explorer/lib/explorer/chain/import.ex
@@ -724,7 +724,7 @@ defmodule Explorer.Chain.Import do
     {:ok, blocks} =
       insert_changes_list(
         ordered_changes_list,
-        conflict_target: :number,
+        conflict_target: :hash,
         on_conflict: :replace_all,
         for: Block,
         returning: true,