diff --git a/lib/cuda/Makefile.defaults b/lib/cuda/Makefile.defaults
index 950d31d4e0..2e208c3649 100644
--- a/lib/cuda/Makefile.defaults
+++ b/lib/cuda/Makefile.defaults
@@ -6,7 +6,7 @@ precision ?= 1
 verbose ?= 1
 
 #GPU architecture (compute capability): 13, 20, 21
-arch ?= 21
+arch ?= 20
 
 #Using cufft (should not be changed)
 cufft ?= 1
diff --git a/lib/cuda/Makefile.lammps b/lib/cuda/Makefile.lammps
index 711e827a65..8ff782f5df 100644
--- a/lib/cuda/Makefile.lammps
+++ b/lib/cuda/Makefile.lammps
@@ -1,5 +1,5 @@
 # Settings that the LAMMPS build will import when this package library is used
-CUDA_FLAGS := -I/usr/local/cuda/include -DUNIX  -DFFT_CUFFT -DCUDA_PRECISION=1 -DCUDA_ARCH=20 
+CUDA_FLAGS := -I/usr/local/cuda/include -DUNIX  -DFFT_CUFFT -DCUDA_PRECISION=1 -DX_PRECISION=2 -DV_PRECISION=2 -DCUDA_ARCH=20 
 CUDA_USRLIB_CONDITIONAL := -L/usr/local/cuda/lib -L/usr/local/cuda/lib64 -lcufft
  
  user-cuda_SYSINC = ${CUDA_FLAGS}