diff --git a/src/KOKKOS/fix_nh_kokkos.cpp b/src/KOKKOS/fix_nh_kokkos.cpp
index 679690ea82215c9a389ff9b417c74385a35a163e..347177b7f454bc03abfd739e8d51f218065b24de 100644
--- a/src/KOKKOS/fix_nh_kokkos.cpp
+++ b/src/KOKKOS/fix_nh_kokkos.cpp
@@ -148,7 +148,7 @@ void FixNHKokkos<DeviceType>::setup(int vflag)
 
   if (pstat_flag) {
     double kt = boltz * t_target;
-    double nkt = atom->natoms * kt;
+    double nkt = (atom->natoms + 1) * kt;
 
     for (int i = 0; i < 3; i++)
       if (p_flag[i])