diff --git a/src/libcore/rand.rs b/src/libcore/rand.rs
index 452ab945251..1881bd784c4 100644
--- a/src/libcore/rand.rs
+++ b/src/libcore/rand.rs
@@ -350,7 +350,7 @@ impl Rng {
     }
 
     /// Shuffle a mutable vec in place
-    fn shuffle_mut<T>(values: &[mut T]) {
+    fn shuffle_mut<T>(values: &mut [T]) {
         let mut i = values.len();
         while i >= 2u {
             // invariant: elements with index >= i have been locked in place.