diff --git a/db/migrate/20221031133328_add_index_to_display_ads_cached_tag_list.rb b/db/migrate/20221031133328_add_index_to_display_ads_cached_tag_list.rb
index 6b61338c8..4d3ac7f39 100644
--- a/db/migrate/20221031133328_add_index_to_display_ads_cached_tag_list.rb
+++ b/db/migrate/20221031133328_add_index_to_display_ads_cached_tag_list.rb
@@ -4,6 +4,6 @@ class AddIndexToDisplayAdsCachedTagList < ActiveRecord::Migration[7.0]
   def change
     # From <https://www.postgresql.org/docs/11/pgtrgm.html#id-1.11.7.40.7>
     # We need a GIN index on `cached_tag_list` to speed up `LIKE` queries
-    add_index :display_ads, :cached_tag_list, using: :gin, opclass: :gin_trgm_ops, algorithm: :concurrently
+    add_index :display_ads, :cached_tag_list, using: :gin, opclass: :gin_trgm_ops, algorithm: :concurrently, if_not_exists: true
   end
 end