--- a/src_libhashdb/hasher/file_reader_helper.hpp
+++ b/src_libhashdb/hasher/file_reader_helper.hpp
@@ -32,6 +32,7 @@

 #include <sys/stat.h>
 #include <fcntl.h>
+#include <cstdint>
 #include "filename_t.hpp"

 // if pread64 is not defined then define it in the global namespace