diff --git a/lib/program.js b/lib/program.js
index c10f85e..5928434 100644
--- a/lib/program.js
+++ b/lib/program.js
@@ -126,6 +126,7 @@ Program.bind = function(program) {
 
   if (!~Program.instances.indexOf(program)) {
     Program.instances.push(program);
+    program.index = Program.total;
     Program.total++;
   }