1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/opt_vec.rs b/src/libsyntax/opt_vec.rs
index 46940d2d4da..ca93cbaea39 100644
--- a/src/libsyntax/opt_vec.rs
+++ b/src/libsyntax/opt_vec.rs
@@ -66,7 +66,7 @@ impl<T> OptVec<T> {
 
     pub fn get<'a>(&'a self, i: uint) -> &'a T {
         match *self {
-            Empty => fail!("Invalid index %u", i),
+            Empty => fail2!("Invalid index {}", i),
             Vec(ref v) => &v[i]
         }
     }