diff --git a/libhdt/src/util/StopWatch.cpp b/libhdt/src/util/StopWatch.cpp
index 2edc368a..a434e2c3 100644
--- a/libhdt/src/util/StopWatch.cpp
+++ b/libhdt/src/util/StopWatch.cpp
@@ -27,6 +27,7 @@
  *
  */
 
+#include <cstdint>
 #include <iostream>
 #include <sstream>