diff --git a/poky/meta/recipes-connectivity/kea/files/0001-add-missing-headers-in-timer_mgr.cc.patch b/poky/meta/recipes-connectivity/kea/files/0001-add-missing-headers-in-timer_mgr.cc.patch
new file mode 100644
index 0000000..1cd8bc7
--- /dev/null
+++ b/poky/meta/recipes-connectivity/kea/files/0001-add-missing-headers-in-timer_mgr.cc.patch
@@ -0,0 +1,29 @@
+From 11981d637273778f408d15f488cc9e1d244dcae8 Mon Sep 17 00:00:00 2001
+From: Andrei Pavel <andrei@isc.org>
+Date: Thu, 29 Jul 2021 21:33:42 +0300
+Subject: [PATCH] add missing headers in timer_mgr.cc
+
+Upstream-Status: Backport [https://github.com/isc-projects/kea/commit/2bba96164f6c5c8f56de7a5dc52af73bfd51cccd]
+Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
+---
+ src/lib/dhcpsrv/timer_mgr.cc | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/src/lib/dhcpsrv/timer_mgr.cc b/src/lib/dhcpsrv/timer_mgr.cc
+index 5ec4123..5611c46 100644
+--- a/src/lib/dhcpsrv/timer_mgr.cc
++++ b/src/lib/dhcpsrv/timer_mgr.cc
+@@ -14,6 +14,13 @@
+ #include <functional>
+ #include <utility>
+ 
++#include <exception>
++#include <map>
++#include <mutex>
++#include <ostream>
++#include <string>
++#include <stddef.h>
++
+ using namespace isc;
+ using namespace isc::asiolink;
+