diff --git a/lisp/lisp.rs b/lisp/lisp.rs
index a9adac39d..556f97e4b 100644
--- a/lisp/lisp.rs
+++ b/lisp/lisp.rs
@@ -281,6 +281,7 @@ fn eval(mut ast: MalVal, mut env: Env) -> MalRet {
                                             Add(b1, b2) => {
                                                 println!("Add {:?} {:?}", b1, b2);
                                                 zk.private.push(Scalar::from_string(&b2.pr_str(false).to_string()));
+                                                env_set(&env, l[1].clone(), zk.clone());
                                                 println!("{:?}", zk);
                                             }
                                             Sub(b1, b2) => {