diff --git a/src/DIELECTRIC/msm_dielectric.h b/src/DIELECTRIC/msm_dielectric.h
index cfc0cb43e2..64982afae2 100644
--- a/src/DIELECTRIC/msm_dielectric.h
+++ b/src/DIELECTRIC/msm_dielectric.h
@@ -30,12 +30,12 @@ class MSMDielectric : public MSM {
   ~MSMDielectric() override;
   void init() override;
   void compute(int, int) override;
-  void fieldforce();
 
   double **efield;
   double *phi;
 
  protected:
+  void fieldforce() override;
   class AtomVecDielectric *avec;
 };
 
diff --git a/src/KSPACE/msm.h b/src/KSPACE/msm.h
index 75cba695fd..980d8182f8 100644
--- a/src/KSPACE/msm.h
+++ b/src/KSPACE/msm.h
@@ -111,8 +111,8 @@ class MSM : public KSpace {
   void allocate_levels();
   void deallocate_levels();
   int factorable(int, int &, int &);
-  void particle_map();
-  void make_rho();
+  virtual void particle_map();
+  virtual void make_rho();
   virtual void direct(int);
   void direct_peratom(int);
   void direct_top(int);
@@ -121,8 +121,8 @@ class MSM : public KSpace {
   void prolongation(int);
   void grid_swap_forward(int, double ***&);
   void grid_swap_reverse(int, double ***&);
-  void fieldforce();
-  void fieldforce_peratom();
+  virtual void fieldforce();
+  virtual void fieldforce_peratom();
   void compute_phis(const double &, const double &, const double &);
   void compute_phis_and_dphis(const double &, const double &, const double &);
   inline double compute_phi(const double &);
diff --git a/src/KSPACE/msm_cg.h b/src/KSPACE/msm_cg.h
index 00680589b5..9ab78ba65d 100644
--- a/src/KSPACE/msm_cg.h
+++ b/src/KSPACE/msm_cg.h
@@ -38,10 +38,10 @@ class MSMCG : public MSM {
   double smallq;
 
  protected:
-  virtual void particle_map();
-  virtual void make_rho();
-  virtual void fieldforce();
-  virtual void fieldforce_peratom();
+  void particle_map() override;
+  void make_rho() override;
+  void fieldforce() override;
+  void fieldforce_peratom() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/OPENMP/msm_cg_omp.h b/src/OPENMP/msm_cg_omp.h
index 253851bb5a..7ad12c8123 100644
--- a/src/OPENMP/msm_cg_omp.h
+++ b/src/OPENMP/msm_cg_omp.h
@@ -38,10 +38,10 @@ class MSMCGOMP : public MSMOMP {
   double smallq;
 
  protected:
-  virtual void particle_map();
-  virtual void make_rho();
-  virtual void fieldforce();
-  virtual void fieldforce_peratom();
+  void particle_map() override;
+  void make_rho() override;
+  void fieldforce() override;
+  void fieldforce_peratom() override;
 };
 
 }    // namespace LAMMPS_NS