diff --git a/doc/compute_heat_flux.txt b/doc/compute_heat_flux.txt
index 4ab6b58088..4ad4863436 100644
--- a/doc/compute_heat_flux.txt
+++ b/doc/compute_heat_flux.txt
@@ -169,7 +169,7 @@ run          8000 :pre
 reset_timestep 0
 compute      myKE all ke/atom
 compute      myPE all pe/atom
-compute      myStress all stress/atom virial
+compute      myStress all stress/atom NULL virial
 compute      flux all heat/flux myKE myPE myStress
 variable     Jx equal c_flux\[1\]/vol
 variable     Jy equal c_flux\[2\]/vol
diff --git a/src/GPU/fix_gpu.cpp b/src/GPU/fix_gpu.cpp
index d80b0b079a..7431d14a82 100644
--- a/src/GPU/fix_gpu.cpp
+++ b/src/GPU/fix_gpu.cpp
@@ -103,9 +103,9 @@ FixGPU::FixGPU(LAMMPS *lmp, int narg, char **arg) :
   while (iarg < narg) {
     if (strcmp(arg[iarg],"neigh") == 0) {
       if (iarg+2 > narg) error->all(FLERR,"Illegal package gpu command");
-      if (strcmp(arg[iarg]+1,"yes") == 0) _gpu_mode = GPU_NEIGH;
-      else if (strcmp(arg[iarg]+1,"no") == 0) _gpu_mode = GPU_FORCE;
-      else if (strcmp(arg[iarg]+1,"hybrid") == 0) _gpu_mode = GPU_HYB_NEIGH;
+      if (strcmp(arg[iarg+1],"yes") == 0) _gpu_mode = GPU_NEIGH;
+      else if (strcmp(arg[iarg+1],"no") == 0) _gpu_mode = GPU_FORCE;
+      else if (strcmp(arg[iarg+1],"hybrid") == 0) _gpu_mode = GPU_HYB_NEIGH;
       else error->all(FLERR,"Illegal package gpu command");
       iarg += 2;
     } else if (strcmp(arg[iarg],"newton") == 0) {