diff --git a/NFIQ2/NFIQ2Algorithm/include/nfiq2_data.hpp b/NFIQ2/NFIQ2Algorithm/include/nfiq2_data.hpp
index 38087268..3d43d073 100644
--- a/NFIQ2/NFIQ2Algorithm/include/nfiq2_data.hpp
+++ b/NFIQ2/NFIQ2Algorithm/include/nfiq2_data.hpp
@@ -13,6 +13,7 @@
 
 #include <nfiq2_exception.hpp>
 
+#include <cstdint>
 #include <fstream>
 #include <string>
 #include <vector>