diff --git a/examples_ptx/rt/rt.ispc b/examples_ptx/rt/rt.ispc
index 1db7ee5e..b9dc930b 100644
--- a/examples_ptx/rt/rt.ispc
+++ b/examples_ptx/rt/rt.ispc
@@ -34,7 +34,7 @@
 typedef bool bool_t;
 typedef float<3> float3;
 
-#if 1
+#if 0
 #define __ORIG
 #endif