diff --git a/include/functions.php b/include/functions.php
index 2ab43e0b6..68844013a 100755
--- a/include/functions.php
+++ b/include/functions.php
@@ -1,6 +1,6 @@
 <?php
 	define('EXPECTED_CONFIG_VERSION', 26);
-	define('SCHEMA_VERSION', 136);
+	define('SCHEMA_VERSION', 137);
 
 	define('LABEL_BASE_INDEX', -1024);
 	define('PLUGIN_FEED_BASE_INDEX', -128);
diff --git a/schema/ttrss_schema_mysql.sql b/schema/ttrss_schema_mysql.sql
index 7f7a834df..133912239 100644
--- a/schema/ttrss_schema_mysql.sql
+++ b/schema/ttrss_schema_mysql.sql
@@ -133,7 +133,8 @@ create table ttrss_feeds (id integer not null auto_increment primary key,
 	feed_language varchar(100) not null default '',
 	foreign key (owner_uid) references ttrss_users(id) ON DELETE CASCADE,
 	foreign key (cat_id) references ttrss_feed_categories(id) ON DELETE SET NULL,
-	foreign key (parent_feed) references ttrss_feeds(id) ON DELETE SET NULL) ENGINE=InnoDB DEFAULT CHARSET=UTF8;
+	foreign key (parent_feed) references ttrss_feeds(id) ON DELETE SET NULL,
+	unique(feed_url(255), owner_uid)) ENGINE=InnoDB DEFAULT CHARSET=UTF8;
 
 insert into ttrss_feeds (owner_uid, title, feed_url) values
 	(1, 'Tiny Tiny RSS: Forum', 'http://tt-rss.org/forum/rss.php');
@@ -286,7 +287,7 @@ create table ttrss_tags (id integer primary key auto_increment,
 
 create table ttrss_version (schema_version int not null) ENGINE=InnoDB DEFAULT CHARSET=UTF8;
 
-insert into ttrss_version values (136);
+insert into ttrss_version values (137);
 
 create table ttrss_enclosures (id integer primary key auto_increment,
 	content_url text not null,
diff --git a/schema/ttrss_schema_pgsql.sql b/schema/ttrss_schema_pgsql.sql
index ca78dd2dc..b5bdba815 100644
--- a/schema/ttrss_schema_pgsql.sql
+++ b/schema/ttrss_schema_pgsql.sql
@@ -99,7 +99,8 @@ create table ttrss_feeds (id serial not null primary key,
 	pubsub_state integer not null default 0,
 	favicon_last_checked timestamp default null,
 	feed_language varchar(100) not null default '',
-	auth_pass_encrypted boolean not null default false);
+	auth_pass_encrypted boolean not null default false,
+	unique(feed_url, owner_uid));
 
 create index ttrss_feeds_owner_uid_index on ttrss_feeds(owner_uid);
 create index ttrss_feeds_cat_id_idx on ttrss_feeds(cat_id);
@@ -268,7 +269,7 @@ create index ttrss_tags_post_int_id_idx on ttrss_tags(post_int_id);
 
 create table ttrss_version (schema_version int not null);
 
-insert into ttrss_version values (136);
+insert into ttrss_version values (137);
 
 create table ttrss_enclosures (id serial not null primary key,
 	content_url text not null,
diff --git a/schema/versions/mysql/137.sql b/schema/versions/mysql/137.sql
new file mode 100644
index 000000000..35dc769b6
--- /dev/null
+++ b/schema/versions/mysql/137.sql
@@ -0,0 +1,7 @@
+begin;
+
+alter table ttrss_feeds add constraint ttrss_feeds_feed_url_owner_uid_key unique (feed_url(254), owner_uid);
+
+update ttrss_version set schema_version = 137;
+
+commit;
diff --git a/schema/versions/pgsql/137.sql b/schema/versions/pgsql/137.sql
new file mode 100644
index 000000000..71b67327e
--- /dev/null
+++ b/schema/versions/pgsql/137.sql
@@ -0,0 +1,7 @@
+begin;
+
+alter table ttrss_feeds add constraint ttrss_feeds_feed_url_owner_uid_key unique (feed_url, owner_uid);
+
+update ttrss_version set schema_version = 137;
+
+commit;