diff --git a/RTX class/Trace.m b/RTX class/Trace.m
index d9e77a4c69eabd0e4101cf144e91169482055b41..3c5a8cd1cf8f8b1971796b65fb491729714955c1 100644
--- a/RTX class/Trace.m	
+++ b/RTX class/Trace.m	
@@ -1,4 +1,4 @@
-classdef Trace
+classdef Trace < handle
  
     properties
         rays Ray = [];