--- a/src/include/buffer_fwd.h
+++ b/src/include/buffer_fwd.h
@@ -1,6 +1,8 @@
 #ifndef BUFFER_FWD_H
 #define BUFFER_FWD_H
 
+#include <cstdint>
+
 namespace ceph {
   namespace buffer {
     inline namespace v15_2_0 {
--- a/src/librbd/api/PoolMetadata.h
+++ b/src/librbd/api/PoolMetadata.h
@@ -7,6 +7,7 @@
 #include "include/buffer_fwd.h"
 #include "include/rados/librados_fwd.hpp"
 
+#include <cstdint>
 #include <map>
 #include <string>
 
--- a/src/client/Trace.h
+++ b/src/client/Trace.h
@@ -18,6 +18,7 @@
 
 #include <stdlib.h>
 
+#include <cstdint>
 #include <list>
 #include <string>
 #include <fstream>
--- a/src/msg/async/compression_onwire.h
+++ b/src/msg/async/compression_onwire.h
@@ -4,6 +4,7 @@
 #ifndef CEPH_COMPRESSION_ONWIRE_H
 #define CEPH_COMPRESSION_ONWIRE_H
 
+#include <cstdint>
 #include <optional>
 
 #include "compressor/Compressor.h"
--- a/src/common/pretty_binary.cc
+++ b/src/common/pretty_binary.cc
@@ -4,6 +4,7 @@
 #include "pretty_binary.h"
 #include <stdexcept>
 #include <sstream>
+#include <cstdint>
 
 std::string pretty_binary_string_reverse(const std::string& pretty)
 {