diff --git a/bmcweb_config.h.in b/bmcweb_config.h.in
index 394cfdf..2e880fc 100644
--- a/bmcweb_config.h.in
+++ b/bmcweb_config.h.in
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <cstdint>
+#include <cstddef>
 
 // clang-format off
 constexpr const int bmcwebInsecureDisableXssPrevention =
diff --git a/include/security_headers.hpp b/include/security_headers.hpp
index 6cf2689..966fbdf 100644
--- a/include/security_headers.hpp
+++ b/include/security_headers.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <bmcweb_config.h>
+
 #include <http_response.hpp>
 
 inline void addSecurityHeaders(const crow::Request& req [[maybe_unused]],
diff --git a/src/webserver_main.cpp b/src/webserver_main.cpp
index 902c32b..eaedc11 100644
--- a/src/webserver_main.cpp
+++ b/src/webserver_main.cpp
@@ -1,3 +1,4 @@
+#include <bmcweb_config.h>
 #include <systemd/sd-daemon.h>
 
 #include <app.hpp>