diff --git a/src/algorithm/neighbour/bbd_tree.rs b/src/algorithm/neighbour/bbd_tree.rs
index 632da86..85e6628 100644
--- a/src/algorithm/neighbour/bbd_tree.rs
+++ b/src/algorithm/neighbour/bbd_tree.rs
@@ -134,7 +134,7 @@ impl<T: RealNumber> BBDTree<T> {
                 return self.filter(
                     self.nodes[node].lower.unwrap(),
                     centroids,
-                    &mut new_candidates,
+                    &new_candidates,
                     newk,
                     sums,
                     counts,
@@ -142,7 +142,7 @@ impl<T: RealNumber> BBDTree<T> {
                 ) + self.filter(
                     self.nodes[node].upper.unwrap(),
                     centroids,
-                    &mut new_candidates,
+                    &new_candidates,
                     newk,
                     sums,
                     counts,
diff --git a/src/lib.rs b/src/lib.rs
index 85aa3b8..80da506 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -74,7 +74,6 @@
     clippy::type_complexity,
     clippy::needless_lifetimes,
     clippy::too_many_arguments,
-    clippy::unnecessary_mut_passed,
     clippy::let_and_return,
     clippy::many_single_char_names,
 )]