diff --git a/migrations/2022-07-07-182650_comment_ltrees/up.sql b/migrations/2022-07-07-182650_comment_ltrees/up.sql
index 9f031ea63..4d2598dda 100644
--- a/migrations/2022-07-07-182650_comment_ltrees/up.sql
+++ b/migrations/2022-07-07-182650_comment_ltrees/up.sql
@@ -30,7 +30,7 @@ drop view comment_alias_1;
 
 alter table comment drop column read;
 
-create extension ltree;
+create extension if not exists ltree;
 
 alter table comment add column path ltree not null default '0';
 alter table comment_aggregates add column child_count integer not null default 0;