diff --git a/src/init_from_settings.cpp b/src/init_from_settings.cpp
index c5cc64b..053585f 100644
--- a/src/init_from_settings.cpp
+++ b/src/init_from_settings.cpp
@@ -16,6 +16,7 @@
 #ifndef BOOST_LOG_WITHOUT_SETTINGS_PARSERS
 
 #include "windows_version.hpp"
+#include <cstddef>
 #include <ios>
 #include <map>
 #include <vector>