diff --git a/src/FileReader.hpp b/src/FileReader.hpp
index effed46..06526c1 100644
--- a/src/FileReader.hpp
+++ b/src/FileReader.hpp
@@ -9,6 +9,7 @@
 #include <iterator>
 #include <string>
 #include <vector>
+#include <cstdint>
 
 #include <iomanip>