diff --git a/src/librand/rand_impls.rs b/src/librand/rand_impls.rs
index 3dd054cee9d1e..77433877ec668 100644
--- a/src/librand/rand_impls.rs
+++ b/src/librand/rand_impls.rs
@@ -203,6 +203,8 @@ tuple_impl!{A, B, C, D, E, F, G}
 tuple_impl!{A, B, C, D, E, F, G, H}
 tuple_impl!{A, B, C, D, E, F, G, H, I}
 tuple_impl!{A, B, C, D, E, F, G, H, I, J}
+tuple_impl!{A, B, C, D, E, F, G, H, I, J, K}
+tuple_impl!{A, B, C, D, E, F, G, H, I, J, K, L}
 
 impl<T:Rand> Rand for Option<T> {
     #[inline]