diff --git a/src/main.rs b/src/main.rs
index c665851..0a3c8e0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -32,7 +32,7 @@ impl List {
 
     pub fn pop(&mut self) -> Option<i32> {
         let result;
-        match &self.head {
+        match std::mem::replace(&mut self.head, Link::Empty) {
             Link::Empty => {
                 result = None;
             }