diff --git a/zabbix-3.4.9-fix_update_dependant_lld_items_zbx13712.patch b/zabbix-3.4.9-fix_update_dependant_lld_items_zbx13712.patch
new file mode 100644
index 0000000..6221239
--- /dev/null
+++ b/zabbix-3.4.9-fix_update_dependant_lld_items_zbx13712.patch
@@ -0,0 +1,30 @@
+diff -Nur -x '*.orig' -x '*.rej' zabbix-3.4.9/frontends/php/include/classes/api/services/CItemGeneral.php mezzanine_patched_zabbix-3.4.9/frontends/php/include/classes/api/services/CItemGeneral.php
+--- zabbix-3.4.9/frontends/php/include/classes/api/services/CItemGeneral.php    2018-05-09 11:57:42.000000000 +0200
++++ mezzanine_patched_zabbix-3.4.9/frontends/php/include/classes/api/services/CItemGeneral.php  2018-05-29 11:25:39.130154434 +0200
+@@ -1630,7 +1630,7 @@
+                $master_itemids = [];
+
+                foreach ($items as $item) {
+-                       if ($item['type'] == ITEM_TYPE_DEPENDENT) {
++                       if ($item['type'] == ITEM_TYPE_DEPENDENT && array_key_exists('master_itemid', $item)) {
+                                $master_itemids[$item['master_itemid']] = true;
+                        }
+                }
+@@ -1645,7 +1645,7 @@   
+                        $host_master_items = [];
+
+                        foreach ($items as $item) {
+-                               if ($item['type'] != ITEM_TYPE_DEPENDENT) {
++                               if ($item['type'] == ITEM_TYPE_DEPENDENT && array_key_exists('master_itemid', $item)) {
+                                        continue;
+                                }
+                                $master_item = $master_items[$item['master_itemid']];
+@@ -1653,7 +1653,7 @@
+                                if (!array_key_exists($item['hostid'], $host_master_items)) {
+                                        $host_master_items[$item['hostid']] = [];
+                                }
+-                               if ($master_item['hostid'] != $item['hostid']) {
++                               if (bccomp($master_item['hostid'], $item['hostid']) != 0) {
+                                        if (!array_key_exists($master_item['key_'], $host_master_items[$item['hostid']])) {
+                                                $inherited_master_items = DB::select('items', [
+                                                        'output' => ['itemid'],
diff --git a/zabbix.spec b/zabbix.spec
index 3b43ab1..056dbd7 100644
--- a/zabbix.spec
+++ b/zabbix.spec
@@ -22,6 +22,8 @@ Source103:      zabbix-agent.service
 Source104:      zabbix-proxy.init
 Source105:      zabbix-proxy.service
 
+Patch0:         zabbix-3.4.9-fix_update_dependant_lld_items_zbx13712.patch
+
 Buildroot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 BuildRequires:  mysql-devel
@@ -216,6 +218,7 @@ Zabbix web frontend for PostgreSQL
 
 %prep
 %setup -q
+%patch0 -p1
 
 mkdir SELinux
 mv %{SOURCE6} %{SOURCE7} SELinux