diff --git a/source/StringUtility.cpp b/source/StringUtility.cpp
index 6adb6c46c..54a379019 100644
--- a/source/StringUtility.cpp
+++ b/source/StringUtility.cpp
@@ -5,6 +5,7 @@
 //
 
 #include "StringUtility.hpp"
+#include <cstdint>
 #include <cctype>
 #include <regex>
 #include <locale>
diff --git a/source/StringUtility.hpp b/source/StringUtility.hpp
index 2be725277..2cb94fe7a 100644
--- a/source/StringUtility.hpp
+++ b/source/StringUtility.hpp
@@ -7,6 +7,7 @@
 #ifndef StringUtility_hpp
 #define StringUtility_hpp
 
+#include <cstdint>
 #include <string>
 #include <vector>
 #include <sstream>