diff --git a/examples_ptx/nbody/nbody.ispc b/examples_ptx/nbody/nbody.ispc
index 6c88708b..217a2680 100644
--- a/examples_ptx/nbody/nbody.ispc
+++ b/examples_ptx/nbody/nbody.ispc
@@ -30,7 +30,7 @@ uniform int nn = programCount;
 
 
 task 
-void computeForces(
+unmasked void computeForces(
     uniform int  nbodies,
     uniform real posx[],
     uniform real posy[],