diff --git a/DESCRIPTION b/DESCRIPTION
index 30aa3dc..7347a28 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -2,7 +2,7 @@ Package: fbseqCUDA
 Title: fbseqCUDA
 Description: Internal CUDA code for package fbseq.
 URL: https://github.com/wlandau/fbseqCUDA
-Version: 0.0
+Version: 0.1
 Author: Will Landau <will.landau@gmail.com>
 Maintainer: Will Landau <will.landau@gmail.com>
 Depends:
diff --git a/src/Makevars b/src/Makevars
index 3a291a6..061d956 100644
--- a/src/Makevars
+++ b/src/Makevars
@@ -6,7 +6,11 @@ R_INC = ${R_HOME}/include
 NVCC = ${CUDA_HOME}/bin/nvcc
 CUDA_INC = ${CUDA_HOME}/include
 PKG_LIBS = -L${CUDA_HOME}/lib64 -Wl,-rpath,${CUDA_HOME}/lib64 -lcuda -lcudart
-NVCC_FLAGS = -x cu -I${R_INC} -Xcompiler "-fPIC" -gencode arch=compute_20,code=sm_20 -gencode arch=compute_30,code=sm_30 -gencode arch=compute_35,code=sm_35
+NVCC_FLAGS = --machine 64 -x cu -I${R_INC} -Xcompiler "-fPIC" \
+  -gencode arch=compute_30,code=sm_30 \
+  -gencode arch=compute_35,code=sm_35 \
+  -gencode arch=compute_50,code=sm_50 \
+  -gencode arch=compute_50,code=compute_50
 
 OBJECTS= fbseqCUDA.o