diff --git a/include/boost/system/detail/generic_category.hpp b/include/boost/system/detail/generic_category.hpp
index cc125f6..98b5708 100644
--- a/include/boost/system/detail/generic_category.hpp
+++ b/include/boost/system/detail/generic_category.hpp
@@ -13,9 +13,7 @@
 #include <boost/system/detail/error_category.hpp>
 #include <boost/system/detail/generic_category_message.hpp>
 #include <boost/system/detail/config.hpp>
-#include <boost/cstdint.hpp>
 #include <boost/config.hpp>
-#include <cstring>
 
 namespace boost
 {
diff --git a/include/boost/system/detail/system_category.hpp b/include/boost/system/detail/system_category.hpp
index 633989b..9e788a6 100644
--- a/include/boost/system/detail/system_category.hpp
+++ b/include/boost/system/detail/system_category.hpp
@@ -12,9 +12,7 @@
 
 #include <boost/system/detail/error_category.hpp>
 #include <boost/system/detail/config.hpp>
-#include <boost/cstdint.hpp>
 #include <boost/config.hpp>
-#include <cstring>
 
 namespace boost
 {