diff --git a/include/boost/beast/core/file_base.hpp b/include/boost/beast/core/file_base.hpp
index 0c0c2625..bb689501 100644
--- a/include/boost/beast/core/file_base.hpp
+++ b/include/boost/beast/core/file_base.hpp
@@ -13,6 +13,7 @@
 #include <boost/beast/core/detail/config.hpp>
 #include <boost/beast/core/error.hpp>
 #include <boost/type_traits/make_void.hpp>
+#include <cstdint>
 #include <type_traits>
 
 namespace boost {
diff --git a/include/boost/beast/http/basic_parser.hpp b/include/boost/beast/http/basic_parser.hpp
index 2ca19040..d2eda05f 100644
--- a/include/boost/beast/http/basic_parser.hpp
+++ b/include/boost/beast/http/basic_parser.hpp
@@ -19,6 +19,7 @@
 #include <boost/asio/buffer.hpp>
 #include <boost/optional.hpp>
 #include <boost/assert.hpp>
+#include <cstdint>
 #include <limits>
 #include <memory>
 #include <type_traits>
diff --git a/include/boost/beast/http/buffer_body.hpp b/include/boost/beast/http/buffer_body.hpp
index 43662229..98768cb8 100644
--- a/include/boost/beast/http/buffer_body.hpp
+++ b/include/boost/beast/http/buffer_body.hpp
@@ -16,6 +16,8 @@
 #include <boost/beast/http/message.hpp>
 #include <boost/beast/http/type_traits.hpp>
 #include <boost/optional.hpp>
+
+#include <cstdint>
 #include <type_traits>
 #include <utility>
 
diff --git a/include/boost/beast/http/detail/rfc7230.hpp b/include/boost/beast/http/detail/rfc7230.hpp
index 35bed0ab..1699f0c7 100644
--- a/include/boost/beast/http/detail/rfc7230.hpp
+++ b/include/boost/beast/http/detail/rfc7230.hpp
@@ -11,6 +11,7 @@
 #define BOOST_BEAST_HTTP_DETAIL_RFC7230_HPP
 
 #include <boost/beast/core/string.hpp>
+#include <cstdint>
 #include <iterator>
 #include <utility>
 
diff --git a/include/boost/beast/http/empty_body.hpp b/include/boost/beast/http/empty_body.hpp
index 17576a11..fb90e061 100644
--- a/include/boost/beast/http/empty_body.hpp
+++ b/include/boost/beast/http/empty_body.hpp
@@ -15,6 +15,8 @@
 #include <boost/beast/http/message.hpp>
 #include <boost/optional.hpp>
 
+#include <cstdint>
+
 namespace boost {
 namespace beast {
 namespace http {
diff --git a/include/boost/beast/http/impl/field.ipp b/include/boost/beast/http/impl/field.ipp
index 29a37fdf..5adb6dc5 100644
--- a/include/boost/beast/http/impl/field.ipp
+++ b/include/boost/beast/http/impl/field.ipp
@@ -14,6 +14,7 @@
 #include <boost/assert.hpp>
 #include <algorithm>
 #include <array>
+#include <cstdint>
 #include <cstring>
 #include <ostream>
 
diff --git a/include/boost/beast/http/parser.hpp b/include/boost/beast/http/parser.hpp
index f780ea6a..4851fe8f 100644
--- a/include/boost/beast/http/parser.hpp
+++ b/include/boost/beast/http/parser.hpp
@@ -16,6 +16,7 @@
 #include <boost/beast/http/type_traits.hpp>
 #include <boost/optional.hpp>
 #include <boost/throw_exception.hpp>
+#include <cstdint>
 #include <functional>
 #include <memory>
 #include <type_traits>
diff --git a/include/boost/beast/http/type_traits.hpp b/include/boost/beast/http/type_traits.hpp
index b8bfdbaa..843e9a91 100644
--- a/include/boost/beast/http/type_traits.hpp
+++ b/include/boost/beast/http/type_traits.hpp
@@ -16,6 +16,7 @@
 #include <boost/beast/http/detail/type_traits.hpp>
 #include <boost/asio/buffer.hpp>
 #include <boost/optional.hpp>
+#include <cstdint>
 #include <type_traits>
 #include <utility>