diff --git a/examples_ptx/mergeSort/Makefile_gpu b/examples_ptx/mergeSort/Makefile_gpu
index 9ed753a4..1532838a 100644
--- a/examples_ptx/mergeSort/Makefile_gpu
+++ b/examples_ptx/mergeSort/Makefile_gpu
@@ -6,7 +6,7 @@ PTXCC_REGMAX=64
 #PTXCC_FLAGS= -Xptxas=-O3
 #NVCC_FLAGS=-Xptxas=-O0
 
-# LLVM_GPU=1
+LLVM_GPU=1
 NVVM_GPU=1
 
 include ../common_gpu.mk
diff --git a/examples_ptx/nbody/nbody.ispc b/examples_ptx/nbody/nbody.ispc
index 3b988a6a..3dda9f51 100644
--- a/examples_ptx/nbody/nbody.ispc
+++ b/examples_ptx/nbody/nbody.ispc
@@ -184,7 +184,7 @@ void nbodyIntegrate(
 {
   uniform int nTasks = num_cores()*4;
 #ifdef __NVPTX__
-  nTasks = (nbodies + 4*programCount - 1)/(4*programCount);
+  nTasks = (nbodies + programCount - 1)/(programCount);
 #endif
   assert((nbodies % nTasks) == 0);
 
diff --git a/examples_ptx/radixSort/Makefile_gpu b/examples_ptx/radixSort/Makefile_gpu
index 2e08ab98..03e2490f 100644
--- a/examples_ptx/radixSort/Makefile_gpu
+++ b/examples_ptx/radixSort/Makefile_gpu
@@ -6,7 +6,7 @@ CU_SRC=radixSort.cu
 CXX_SRC=radixSort.cpp  radixSort.cpp
 PTXCC_REGMAX=64
 
-# LLVM_GPU=1
+LLVM_GPU=1
 NVVM_GPU=1
 
 include ../common_gpu.mk