diff --git a/update/database/mysql/5.0/dbupdate-4.7.0-to-5.0.0.sql b/update/database/mysql/5.0/dbupdate-4.7.0-to-5.0.0.sql
index 29fe5f0bbc4..f243139231a 100644
--- a/update/database/mysql/5.0/dbupdate-4.7.0-to-5.0.0.sql
+++ b/update/database/mysql/5.0/dbupdate-4.7.0-to-5.0.0.sql
@@ -15,7 +15,7 @@ UPDATE ezcobj_state_group_language SET real_language_id = language_id & ~1;
 ALTER TABLE ezgeneral_digest_user_settings ADD COLUMN user_id int(11) NOT NULL default '0';
 DELETE FROM ezgeneral_digest_user_settings WHERE address NOT IN (SELECT email FROM ezuser);
 UPDATE ezgeneral_digest_user_settings SET user_id = (SELECT ezuser.contentobject_id
-           FROM ezuser WHERE ezuser.email = ezgeneral_digest_user_settings.address);
+           FROM ezuser WHERE ezuser.email = ezgeneral_digest_user_settings.address LIMIT 1);
 ALTER TABLE ezgeneral_digest_user_settings ADD UNIQUE INDEX ezgeneral_digest_user_id (user_id);
 ALTER TABLE ezgeneral_digest_user_settings DROP COLUMN address;
 ALTER TABLE ezuser ADD INDEX ezuser_login (login);
diff --git a/update/database/postgresql/5.0/dbupdate-4.7.0-to-5.0.0.sql b/update/database/postgresql/5.0/dbupdate-4.7.0-to-5.0.0.sql
index ba8b1ddf418..d768066b22d 100644
--- a/update/database/postgresql/5.0/dbupdate-4.7.0-to-5.0.0.sql
+++ b/update/database/postgresql/5.0/dbupdate-4.7.0-to-5.0.0.sql
@@ -14,7 +14,7 @@ UPDATE ezcobj_state_group_language SET real_language_id = language_id & ~1;
 ALTER TABLE ezgeneral_digest_user_settings ADD user_id integer DEFAULT 0 NOT NULL;
 DELETE FROM ezgeneral_digest_user_settings WHERE address NOT IN (SELECT email FROM ezuser);
 UPDATE ezgeneral_digest_user_settings SET user_id = (SELECT ezuser.contentobject_id
-           FROM ezuser WHERE ezuser.email = ezgeneral_digest_user_settings.address);
+           FROM ezuser WHERE ezuser.email = ezgeneral_digest_user_settings.address LIMIT 1);
 CREATE INDEX ezgeneral_digest_user_id ON ezgeneral_digest_user_settings USING btree (user_id);
 ALTER TABLE ezgeneral_digest_user_settings DROP COLUMN address;
 CREATE INDEX ezuser_login ON ezuser USING btree (login);