diff --git a/schema/versions/mysql/137.sql b/schema/versions/mysql/137.sql
index 35dc769b6..45e4de02f 100644
--- a/schema/versions/mysql/137.sql
+++ b/schema/versions/mysql/137.sql
@@ -1,6 +1,6 @@
 begin;
 
-alter table ttrss_feeds add constraint ttrss_feeds_feed_url_owner_uid_key unique (feed_url(254), owner_uid);
+alter table ttrss_feeds add constraint ttrss_feeds_feed_url_owner_uid_key unique (feed_url(255), owner_uid);
 
 update ttrss_version set schema_version = 137;