diff --git a/lib/cuda/Makefile.defaults b/lib/cuda/Makefile.defaults
index 16445cca18..2e208c3649 100644
--- a/lib/cuda/Makefile.defaults
+++ b/lib/cuda/Makefile.defaults
@@ -1,6 +1,6 @@
 
 #precision setting: 1 single, 2 double, 4 mixed
-precision ?= 4
+precision ?= 1
 
 #verbose setting: 0 no, 1 yes
 verbose ?= 1
diff --git a/lib/cuda/Makefile.lammps b/lib/cuda/Makefile.lammps
index cb98690689..593a924182 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 -DX_PRECISION=2 -DV_PRECISION=2 -DCUDA_ARCH=20 
+CUDA_FLAGS := -I/usr/local/cuda/include -DUNIX  -DFFT_CUFFT -DCUDA_PRECISION=1 -DCUDA_ARCH=20 
 CUDA_USRLIB_CONDITIONAL := -L/usr/local/cuda/lib -L/usr/local/cuda/lib64 -lcufft
  
 user-cuda_SYSINC = ${CUDA_FLAGS}