diff --git a/src/doc/book/vectors.md b/src/doc/book/vectors.md
index 6ac701e29698..e96dddf8c82c 100644
--- a/src/doc/book/vectors.md
+++ b/src/doc/book/vectors.md
@@ -120,7 +120,7 @@ You can iterate the vector multiple times by taking a reference to the vector wh
 For example, the following code does not compile.
 
 ```rust,ignore
-let mut v = vec![1, 2, 3, 4, 5];
+let v = vec![1, 2, 3, 4, 5];
 
 for i in v {
     println!("Take ownership of the vector and its element {}", i);
@@ -134,7 +134,7 @@ for i in v {
 Whereas the following works perfectly,
 
 ```rust
-let mut v = vec![1, 2, 3, 4, 5];
+let v = vec![1, 2, 3, 4, 5];
 
 for i in &v {
     println!("This is a reference to {}", i);