diff --git a/src/lisp/environment.rs b/src/lisp/environment.rs
index 577733e..1ddae79 100644
--- a/src/lisp/environment.rs
+++ b/src/lisp/environment.rs
@@ -82,7 +82,7 @@ impl<'a> Environment<'a> {
         Environment {
             layer,
             outer: Some(&self),
-            shared: Rc::new(RefCell::new(EnvironmentLayer::new())),
+            shared: self.shared.clone(),
         }
     }