diff --git a/include/Options.h b/include/Options.h
index 29806c2..3f2e308 100644
--- a/include/Options.h
+++ b/include/Options.h
@@ -8,7 +8,7 @@
 #define OPTIONS_H
 #include <string>
 #include <vector>
-
+#include <cstdint>
 #include <Order.h>
 
 namespace ling {