diff --git a/include/utf8.h b/include/utf8.h
index b677ce8..00f713b 100644
--- a/include/utf8.h
+++ b/include/utf8.h
@@ -4,6 +4,7 @@
 #include <stdexcept>
 #include <string>
 #include <vector>
+#include <cstdint>
 
 namespace Url
 {