diff --git a/src-java/play_clj/g3d_physics/ContactListener.java b/src-java/play_clj/g3d_physics/ContactListener.java
index 2b51051..a81edc0 100644
--- a/src-java/play_clj/g3d_physics/ContactListener.java
+++ b/src-java/play_clj/g3d_physics/ContactListener.java
@@ -1,5 +1,6 @@
 package play_clj.g3d_physics;
 
+imrpot com.badlogic.gdx.physics.bullet.collision.btCollisionObject;
 import clojure.lang.IFn;
 
 public class ContactListener extends com.badlogic.gdx.physics.bullet.collision.ContactListener {