diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2b7c4b6..0b66e8e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required (VERSION 3.5 FATAL_ERROR)
 project (node-manager-proxy CXX)
-set (CMAKE_CXX_STANDARD 17)
+set (CMAKE_CXX_STANDARD 20)
 set (CMAKE_CXX_STANDARD_REQUIRED ON)
 set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
 set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-rtti")
diff --git a/NodeManagerProxy.hpp b/NodeManagerProxy.hpp
index 15d4e97..bdeeafe 100644
--- a/NodeManagerProxy.hpp
+++ b/NodeManagerProxy.hpp
@@ -13,6 +13,7 @@
  *  limitations under the License.
  */
 
+#include <boost/container/flat_map.hpp>
 #include <boost/container/flat_set.hpp>
 #include <phosphor-logging/log.hpp>
 #include <sdbusplus/asio/object_server.hpp>