diff --git a/src/rigidbody.h b/src/rigidbody.h
index 4a77219..c1d4637 100644
--- a/src/rigidbody.h
+++ b/src/rigidbody.h
@@ -10,7 +10,6 @@ struct Collision;
 typedef struct {
     struct Collision hit;
     float duration;
-    int expiry;
 } Contact;
 typedef struct RigidBody RigidBody;
 typedef void (*CollisionHandlerFn)(void* obj, List* collisions);