diff --git a/src/be20_api/unicode_escape.h b/src/be20_api/unicode_escape.h
--- a/src/be20_api/unicode_escape.h
+++ b/src/be20_api/unicode_escape.h
@@ -8,7 +8,7 @@
 #define UNICODE_ESCAPE_H
 
 #include <codecvt>
-//#include <cstdint>
+#include <cstdint>
 #include <cstring>
 #include <cwctype>
 #include <iostream>