diff --git a/src/compute_gyration.cpp b/src/compute_gyration.cpp
index 438914278e..1025b8fc2a 100644
--- a/src/compute_gyration.cpp
+++ b/src/compute_gyration.cpp
@@ -109,5 +109,5 @@ void ComputeGyration::compute_vector()
   MPI_Allreduce(rg,vector,6,MPI_DOUBLE,MPI_SUM,world);
 
   if (masstotal == 0.0) return;
-  for (int i = 0; i < 6; i++) vector[i] = sqrt(vector[i]/masstotal);
+  for (int i = 0; i < 6; i++) vector[i] = vector[i]/masstotal;
 }
diff --git a/src/compute_gyration_molecule.cpp b/src/compute_gyration_molecule.cpp
index 179d4f5f92..cd36fe2021 100644
--- a/src/compute_gyration_molecule.cpp
+++ b/src/compute_gyration_molecule.cpp
@@ -212,7 +212,7 @@ void ComputeGyrationMolecule::compute_array()
 
   for (i = 0; i < nmolecules; i++)
     for (j = 0; j < 6; j++)
-      array[i][j] = sqrt(array[i][j]/masstotal[i]);
+      array[i][j] = array[i][j]/masstotal[i];
 }
 
 
diff --git a/src/fix_ave_spatial.cpp b/src/fix_ave_spatial.cpp
index dab6749ea9..5369dc2fd2 100644
--- a/src/fix_ave_spatial.cpp
+++ b/src/fix_ave_spatial.cpp
@@ -158,6 +158,8 @@ FixAveSpatial::FixAveSpatial(LAMMPS *lmp, int narg, char **arg) :
     iarg++;
   }
 
+  if (nvalues == 0) error->all(FLERR,"No input values for fix ave/spatial");
+
   // optional args
 
   regionflag = 0;