diff --git a/swig/Lib/ocaml/ocamldec.swg b/swig/Lib/ocaml/ocamldec.swg

index 96e1cd2..899741c 100644

--- a/swig/Lib/ocaml/ocamldec.swg

+++ b/swig/Lib/ocaml/ocamldec.swg

@@ -101,9 +101,9 @@ SWIGEXT {

 #ifndef ARCH_ALIGN_INT64

-#define SWIG_Int64_val(v) (*((int64 *) SWIG_Data_custom_val(v)))

+#define SWIG_Int64_val(v) (*((int64_t *) SWIG_Data_custom_val(v)))

 #else

-CAMLextern int64 Int64_val(caml_value_t v);

+CAMLextern int64_t Int64_val(caml_value_t v);

 #define SWIG_Int64_val(v) Int64_val(v)

 #endif