diff --git a/claujson.h b/claujson.h
index dd42c3b..484ac01 100644
--- a/claujson.h
+++ b/claujson.h
@@ -11,7 +11,7 @@
 #include <set>
 #include <fstream>
 #include <cstring>
-
+#include <cstdint> // uint64_t? int64_t?
 
 #include "ThreadPool.h"