diff --git a/cpp/tool/filename.h b/cpp/tool/filename.h
index 05e2a8d..a70ddea 100644
--- a/cpp/tool/filename.h
+++ b/cpp/tool/filename.h
@@ -52,6 +52,7 @@
 
 #include <algorithm>
 #include <cassert>
+#include <cstdint>
 #include <string>
 #include <iostream>
 #include <sstream>
diff --git a/cpp/tool/pooling.h b/cpp/tool/pooling.h
index a88d4f0..7b5f6ff 100644
--- a/cpp/tool/pooling.h
+++ b/cpp/tool/pooling.h
@@ -53,6 +53,7 @@
 #include <cmath>
 #include <vector>
 #include <string>
+#include <cstdint>
 #include <sstream>
 #include <fstream>
 #include <iostream>