diff --git a/src/compute_gyration.cpp b/src/compute_gyration.cpp
index 8c4c7d0305..551cfc85bb 100644
--- a/src/compute_gyration.cpp
+++ b/src/compute_gyration.cpp
@@ -113,5 +113,5 @@ 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] /= masstotal;
 }
diff --git a/src/compute_gyration_molecule.cpp b/src/compute_gyration_molecule.cpp
index df107e8303..412a64e2e7 100644
--- a/src/compute_gyration_molecule.cpp
+++ b/src/compute_gyration_molecule.cpp
@@ -222,7 +222,7 @@ 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] /= masstotal[i];
 }