diff --git a/jme3-bullet/src/main/java/com/jme3/bullet/PhysicsSpace.java b/jme3-bullet/src/main/java/com/jme3/bullet/PhysicsSpace.java
index 46eff032c..cae59d8ef 100644
--- a/jme3-bullet/src/main/java/com/jme3/bullet/PhysicsSpace.java
+++ b/jme3-bullet/src/main/java/com/jme3/bullet/PhysicsSpace.java
@@ -54,6 +54,7 @@ import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Comparator;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentLinkedQueue;