diff --git a/lib/db_ido_mysql/schema/mysql.sql b/lib/db_ido_mysql/schema/mysql.sql
index 882438b75..27fd99e88 100644
--- a/lib/db_ido_mysql/schema/mysql.sql
+++ b/lib/db_ido_mysql/schema/mysql.sql
@@ -735,7 +735,7 @@ CREATE TABLE IF NOT EXISTS icinga_hoststatus (
   notifications_enabled smallint default 0,
   problem_has_been_acknowledged smallint default 0,
   acknowledgement_type smallint default 0,
-  current_notification_number smallint default 0,
+  current_notification_number int unsigned default 0,
   passive_checks_enabled smallint default 0,
   active_checks_enabled smallint default 0,
   event_handler_enabled smallint default 0,
@@ -1223,7 +1223,7 @@ CREATE TABLE IF NOT EXISTS icinga_servicestatus (
   notifications_enabled smallint default 0,
   problem_has_been_acknowledged smallint default 0,
   acknowledgement_type smallint default 0,
-  current_notification_number smallint default 0,
+  current_notification_number int unsigned default 0,
   passive_checks_enabled smallint default 0,
   active_checks_enabled smallint default 0,
   event_handler_enabled smallint default 0,
diff --git a/lib/db_ido_mysql/schema/upgrade/2.5.0.sql b/lib/db_ido_mysql/schema/upgrade/2.5.0.sql
index 0fa238598..8f6f39660 100644
--- a/lib/db_ido_mysql/schema/upgrade/2.5.0.sql
+++ b/lib/db_ido_mysql/schema/upgrade/2.5.0.sql
@@ -21,6 +21,13 @@ ALTER TABLE icinga_servicestatus MODIFY COLUMN check_source varchar(255) charact
 CREATE INDEX idx_comments_object_id on icinga_comments(object_id);
 CREATE INDEX idx_scheduleddowntime_object_id on icinga_scheduleddowntime(object_id);
 
+-- -----------------------------------------
+-- #11962
+-- -----------------------------------------
+
+ALTER TABLE icinga_hoststatus MODIFY COLUMN current_notification_number int unsigned default 0;
+ALTER TABLE icinga_servicestatus MODIFY COLUMN current_notification_number int unsigned default 0;
+
 -- -----------------------------------------
 -- set dbversion
 -- -----------------------------------------