diff --git a/libhdt/src/util/StopWatch.hpp b/libhdt/src/util/StopWatch.hpp
index 0cc0e450..ae395fc7 100644
--- a/libhdt/src/util/StopWatch.hpp
+++ b/libhdt/src/util/StopWatch.hpp
@@ -38,6 +38,7 @@
 #endif
 
 #include <string>
+#include <cstdint>
 #include <iostream>
 
 class StopWatch {