diff --git a/src/machine.rs b/src/machine.rs
index 9d1dd8e..9ed52f2 100644
--- a/src/machine.rs
+++ b/src/machine.rs
@@ -18,23 +18,23 @@ pub struct Instruction {
     pub argument: usize,
 }
 
-pub struct Machine {
+pub struct Machine<'a> {
     ip: usize,
     mp: usize,
     code: Vec<Instruction>,
     memory: [u32; 50000],
-    input: &mut BufReader<Box<dyn Read>>,
-    output: &mut BufWriter<Box<dyn Write>>,
+    input: &'a mut BufReader<Box<dyn Read>>,
+    output: &'a mut BufWriter<Box<dyn Write>>,
     buf: [u8; 1],
 }
 
-impl Machine {
-    pub fn new(code: Vec<Instruction>, input: &mut BufReader<Box<dyn Read>>, output: &mut BufWriter<Box<dyn Write>>) -> Self {
+impl<'a> Machine<'a> {
+    pub fn new(code: Vec<Instruction>, input: &'a mut BufReader<Box<dyn Read>>, output: &'a mut BufWriter<Box<dyn Write>>) -> Self {
         Machine {
             ip: 0,
             mp: 0,
             code,
-            memory: [0, 50000],
+            memory: [0; 50000],
             input,
             output,
             buf: [0;1],