diff --git a/include/libnuraft/asio_service_options.hxx b/include/libnuraft/asio_service_options.hxx
index 8fe1ec9..9497355 100644
--- a/include/libnuraft/asio_service_options.hxx
+++ b/include/libnuraft/asio_service_options.hxx
@@ -17,6 +17,7 @@ limitations under the License.
 
 #pragma once
 
+#include <cstdint>
 #include <functional>
 #include <string>
 #include <system_error>
diff --git a/include/libnuraft/callback.hxx b/include/libnuraft/callback.hxx
index 7b71624..d48c1e2 100644
--- a/include/libnuraft/callback.hxx
+++ b/include/libnuraft/callback.hxx
@@ -18,6 +18,7 @@ limitations under the License.
 #ifndef _CALLBACK_H_
 #define _CALLBACK_H_
 
+#include <cstdint>
 #include <functional>
 #include <string>