1 files changed, 3 insertions, 2 deletions
diff --git a/src/lib.rs b/src/lib.rs
index 7caadd0..eecdcaf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,5 @@
 use num::{One, Zero};
+use std::mem;
 use std::ops::Add;
 
 #[derive(Debug)]
@@ -21,8 +22,8 @@ impl<T: Clone + Add<Output = T>> Iterator for Fib<T> {
 
     fn next(&mut self) -> Option<Self::Item> {
         let res = self.a.clone();
-        self.a = self.b.clone();
-        self.b = res.clone() + self.a.clone();
+        mem::swap(&mut self.a, &mut self.b);
+        self.b = self.b.clone() + self.a.clone();
 
         Some(res)
     }