diff --git a/panda/src/collide/collisionBox.cxx b/panda/src/collide/collisionBox.cxx
index 8528e7bc27..2f5385b9bf 100644
--- a/panda/src/collide/collisionBox.cxx
+++ b/panda/src/collide/collisionBox.cxx
@@ -186,6 +186,7 @@ get_test_pcollector() {
  */
 void CollisionBox::
 output(std::ostream &out) const {
+  out << "box, (" << get_min() << ") to (" << get_max() << ")";
 }
 
 /**