diff --git a/src/stringImproved.h b/src/stringImproved.h
index d777b81..f8c5c59 100644
--- a/src/stringImproved.h
+++ b/src/stringImproved.h
@@ -2,6 +2,7 @@
 #define STRING_IMPROVED_H
 
 #include <cstdlib>
+#include <cstdint>
 #include <string>
 #include <string_view>
 #include <limits>