diff --git a/src/main/java/org/forkalsrud/util/VpTree.java b/src/main/java/org/forkalsrud/util/VpTree.java
index 3eaf0ac..3c860df 100644
--- a/src/main/java/org/forkalsrud/util/VpTree.java
+++ b/src/main/java/org/forkalsrud/util/VpTree.java
@@ -13,7 +13,7 @@ public class VpTree<T> {
         public double distance(T a, T b);
     }
 
-    private Metric metric;
+    private Metric<T> metric;
     private Random random;
     private Node root;
 
@@ -72,12 +72,6 @@ public class VpTree<T> {
         return results;
     }
 
-    static void swap(ArrayList points, int a, int b) {
-        Object temp = points.get(a);
-        points.set(a, points.get(b));
-        points.set(b, temp);
-    }
-
     
     Node buildFromPoints(ArrayList<WithDistance> points, int left, int right) {