diff --git a/crates/saft-eval/src/interpreter.rs b/crates/saft-eval/src/interpreter.rs
index 099908c..eacbd14 100644
--- a/crates/saft-eval/src/interpreter.rs
+++ b/crates/saft-eval/src/interpreter.rs
@@ -5,6 +5,7 @@ use saft_ast::{Block, Expr, Ident, Item, Module, Statement};
 use saft_common::span::{Span, Spanned};
 use std::borrow::Borrow;
 use std::collections::HashMap;
+use std::rc::Rc;
 
 #[macro_export]
 macro_rules! exotic {
@@ -141,10 +142,10 @@ impl Interpreter {
                 params,
                 body,
             }) => {
-                let fun = Value::Function(Function::SaftFunction(SaftFunction {
+                let fun = Value::Function(Rc::new(Function::SaftFunction(SaftFunction {
                     params: params.clone(),
                     body: body.clone(),
-                }));
+                })));
                 self.env.declare(ident, fun);
                 Ok(())
             }
@@ -316,8 +317,10 @@ impl Interpreter {
                     arg_vals.push(self.eval_expr(arg)?);
                 }
 
-                match fun.v {
-                    Value::Function(Function::SaftFunction(SaftFunction { params, body })) => {
+                match &fun.v {
+                    Value::Function(fun)
+                        if let Function::SaftFunction(SaftFunction { params, body }) = fun.as_ref() =>
+                    {
                         match self.scoped(|interpreter| {
                             if arg_vals.len() != params.len() {
                                 return Err(Exception::ArgMismatch {
@@ -339,7 +342,9 @@ impl Interpreter {
                             Err(e) => return Err(e),
                         }
                     }
-                    Value::Function(Function::NativeFunction(NativeFuncData { f, .. })) => {
+                    Value::Function(fun)
+                        if let Function::NativeFunction(NativeFuncData { f, .. }) = fun.as_ref() =>
+                    {
                         f(self, &s, arg_vals)?
                     }
                     _ => {
diff --git a/crates/saft-eval/src/natives.rs b/crates/saft-eval/src/natives.rs
index beffafd..e7a56b1 100644
--- a/crates/saft-eval/src/natives.rs
+++ b/crates/saft-eval/src/natives.rs
@@ -1,3 +1,5 @@
+use std::rc::Rc;
+
 use crate::interpreter::{ControlFlow, Interpreter};
 use crate::{cast_error, exotic};
 use saft_common::span::{Span, Spanned};
@@ -69,6 +71,6 @@ fn add_native<N: NativeFunc>(env: &mut Env) {
     let data = N::data();
     env.declare_unspanned(
         &data.name.into(),
-        Value::Function(Function::NativeFunction(data)),
+        Value::Function(Rc::new(Function::NativeFunction(data))),
     );
 }
diff --git a/crates/saft-eval/src/value.rs b/crates/saft-eval/src/value.rs
index ef2e61d..12c366a 100644
--- a/crates/saft-eval/src/value.rs
+++ b/crates/saft-eval/src/value.rs
@@ -1,5 +1,5 @@
 use crate::interpreter::{ControlFlow, Interpreter};
-use std::borrow::Borrow;
+use std::{borrow::Borrow, rc::Rc};
 
 use saft_ast::Block;
 use saft_common::span::{Span, Spanned};
@@ -8,7 +8,7 @@ use saft_common::span::{Span, Spanned};
 pub enum Value {
     Nil,
     Num(Num),
-    Function(Function),
+    Function(Rc<Function>),
     String(String),
     Vec(Vec<Value>),
 }
@@ -18,8 +18,10 @@ impl Value {
         match self {
             Value::Nil => "nil".into(),
             Value::Num(num) => num.repr(),
-            Value::Function(Function::SaftFunction(..)) => "<function>".into(),
-            Value::Function(Function::NativeFunction(..)) => "<builtin function>".into(),
+            Value::Function(fun) => match fun.as_ref() {
+                Function::SaftFunction(_) => "<function>".into(),
+                Function::NativeFunction(_) => "<builtin function>".into(),
+            },
             Value::String(s) => format!("\"{}\"", s),
             Value::Vec(vals) => {
                 let mut buf = String::new();