diff --git a/src/obj/int.rs b/src/obj/int.rs
index d221213..79670c8 100644
--- a/src/obj/int.rs
+++ b/src/obj/int.rs
@@ -4,7 +4,7 @@ use shredder::Scan;
 use std::fmt::{Debug, Formatter, self};
 
 pub type IntRef = ObjRef<Int>;
-pub type IntValue = i64;
+pub type IntValue = i128;
 
 #[derive(Scan)]
 pub struct Int {