diff --git a/src/angle.h b/src/angle.h
index 3a6521003e..12443fa4f3 100644
--- a/src/angle.h
+++ b/src/angle.h
@@ -43,7 +43,7 @@ class Angle : protected Pointers {
   int copymode;
 
   Angle(class LAMMPS *);
-  virtual ~Angle();
+  ~Angle() override;
   virtual void init();
   virtual void compute(int, int) = 0;
   virtual void settings(int, char **) {}
diff --git a/src/atom.h b/src/atom.h
index 25a56de1c4..ad8349d11c 100644
--- a/src/atom.h
+++ b/src/atom.h
@@ -284,7 +284,7 @@ class Atom : protected Pointers {
   // functions
 
   Atom(class LAMMPS *);
-  virtual ~Atom();
+  ~Atom() override;
 
   void settings(class Atom *);
   void peratom_create();
diff --git a/src/atom_vec.h b/src/atom_vec.h
index 6bc7f23532..ad1c7f3315 100644
--- a/src/atom_vec.h
+++ b/src/atom_vec.h
@@ -68,7 +68,7 @@ class AtomVec : protected Pointers {
   // methods
 
   AtomVec(class LAMMPS *);
-  virtual ~AtomVec();
+  ~AtomVec() override;
 
   void store_args(int, char **);
   virtual void process_args(int, char **);
diff --git a/src/bond.h b/src/bond.h
index b2b2008b9e..9b9f35180a 100644
--- a/src/bond.h
+++ b/src/bond.h
@@ -39,7 +39,7 @@ class Bond : protected Pointers {
   int copymode;
 
   Bond(class LAMMPS *);
-  virtual ~Bond();
+  ~Bond() override;
   virtual void init();
   virtual void init_style() {}
   virtual void compute(int, int) = 0;
diff --git a/src/compute.h b/src/compute.h
index 05fded9b44..ef57754b18 100644
--- a/src/compute.h
+++ b/src/compute.h
@@ -104,7 +104,7 @@ class Compute : protected Pointers {
   int copymode, kokkosable;
 
   Compute(class LAMMPS *, int, char **);
-  virtual ~Compute();
+  ~Compute() override;
   void modify_params(int, char **);
   void reset_extra_dof();
 
diff --git a/src/dihedral.h b/src/dihedral.h
index 81daeef201..7bb7eb2650 100644
--- a/src/dihedral.h
+++ b/src/dihedral.h
@@ -43,7 +43,7 @@ class Dihedral : protected Pointers {
   int copymode;
 
   Dihedral(class LAMMPS *);
-  virtual ~Dihedral();
+  ~Dihedral() override;
   virtual void init();
   virtual void init_style() {}
   virtual void compute(int, int) = 0;
diff --git a/src/fix.h b/src/fix.h
index 339da03734..a83b032172 100644
--- a/src/fix.h
+++ b/src/fix.h
@@ -130,7 +130,7 @@ class Fix : protected Pointers {
   unsigned int datamask_read, datamask_modify;
 
   Fix(class LAMMPS *, int, char **);
-  virtual ~Fix();
+  ~Fix() override;
   void modify_params(int, char **);
 
   virtual int setmask() = 0;
diff --git a/src/force.h b/src/force.h
index 09e13c7bd1..df00887ed0 100644
--- a/src/force.h
+++ b/src/force.h
@@ -117,7 +117,7 @@ class Force : protected Pointers {
   int special_extra;         // extra space for added bonds
 
   Force(class LAMMPS *);
-  ~Force();
+  ~Force() override;
   void init();
   void setup();
 
diff --git a/src/improper.h b/src/improper.h
index 1f88204a6b..dbe8bee3f1 100644
--- a/src/improper.h
+++ b/src/improper.h
@@ -43,7 +43,7 @@ class Improper : protected Pointers {
   int copymode;
 
   Improper(class LAMMPS *);
-  virtual ~Improper();
+  ~Improper() override;
   virtual void init();
   virtual void init_style() {}
   virtual void compute(int, int) = 0;
diff --git a/src/integrate.h b/src/integrate.h
index e38fad79dc..e2bf3d33e1 100644
--- a/src/integrate.h
+++ b/src/integrate.h
@@ -21,7 +21,7 @@ namespace LAMMPS_NS {
 class Integrate : protected Pointers {
  public:
   Integrate(class LAMMPS *, int, char **);
-  virtual ~Integrate();
+  ~Integrate() override;
   virtual void init();
   virtual void setup(int flag) = 0;
   virtual void setup_minimal(int) = 0;
diff --git a/src/kspace.h b/src/kspace.h
index 22453d51a8..68d169ea97 100644
--- a/src/kspace.h
+++ b/src/kspace.h
@@ -100,7 +100,7 @@ class KSpace : protected Pointers {
   double splittol;    // tolerance for when to truncate splitting
 
   KSpace(class LAMMPS *);
-  virtual ~KSpace();
+  ~KSpace() override;
   void two_charge();
   void triclinic_check();
   void modify_params(int, char **);
diff --git a/src/modify.h b/src/modify.h
index c4f8c2ef02..e340012b04 100644
--- a/src/modify.h
+++ b/src/modify.h
@@ -53,7 +53,7 @@ class Modify : protected Pointers {
   Compute **compute;    // list of computes
 
   Modify(class LAMMPS *);
-  virtual ~Modify();
+  ~Modify() override;
   virtual void init();
   virtual void setup(int);
   virtual void setup_pre_exchange();
diff --git a/src/neigh_list.h b/src/neigh_list.h
index 8b920bbe50..abd9b8205e 100644
--- a/src/neigh_list.h
+++ b/src/neigh_list.h
@@ -102,7 +102,7 @@ class NeighList : protected Pointers {
   // methods
 
   NeighList(class LAMMPS *);
-  virtual ~NeighList();
+  ~NeighList() override;
   void post_constructor(class NeighRequest *);
   void setup_pages(int, int);    // setup page data structures
   void grow(int, int);           // grow all data structs
diff --git a/src/neighbor.h b/src/neighbor.h
index a64e52fdbb..60687525a3 100644
--- a/src/neighbor.h
+++ b/src/neighbor.h
@@ -117,7 +117,7 @@ class Neighbor : protected Pointers {
   // public methods
 
   Neighbor(class LAMMPS *);
-  virtual ~Neighbor();
+  ~Neighbor() override;
   virtual void init();
   int request(void *, int instance = 0);
   int decide();                     // decide whether to build or not
diff --git a/src/output.h b/src/output.h
index 3f557bdef5..14c1de6522 100644
--- a/src/output.h
+++ b/src/output.h
@@ -71,7 +71,7 @@ class Output : protected Pointers {
   DumpCreatorMap *dump_map;
 
   Output(class LAMMPS *);
-  ~Output();
+  ~Output() override;
   void init();
   void setup(int memflag = 1);    // initial output before run/min
   void write(bigint);             // output for current timestep
diff --git a/src/pair.h b/src/pair.h
index 00e6734773..a61af0c1da 100644
--- a/src/pair.h
+++ b/src/pair.h
@@ -123,7 +123,7 @@ class Pair : protected Pointers {
   int kokkosable;    // 1 if Kokkos pair
 
   Pair(class LAMMPS *);
-  virtual ~Pair();
+  ~Pair() override;
 
   // top-level Pair methods
 
diff --git a/src/thermo.h b/src/thermo.h
index 89678614a7..9eca4df18b 100644
--- a/src/thermo.h
+++ b/src/thermo.h
@@ -34,7 +34,7 @@ class Thermo : protected Pointers {
   enum { INT, FLOAT, BIGINT };
 
   Thermo(class LAMMPS *, int, char **);
-  ~Thermo();
+  ~Thermo() override;
   void init();
   bigint lost_check();
   void modify_params(int, char **);
diff --git a/src/timer.h b/src/timer.h
index a1fb592e43..245a81d660 100644
--- a/src/timer.h
+++ b/src/timer.h
@@ -44,7 +44,7 @@ class Timer : protected Pointers {
   enum tlevel { OFF = 0, LOOP, NORMAL, FULL };
 
   Timer(class LAMMPS *);
-  ~Timer(){};
+  ~Timer() override = default;
   void init();
 
   // inline function to reduce overhead if we want no detailed timings
diff --git a/src/universe.h b/src/universe.h
index 30644dcd6d..3e5710a301 100644
--- a/src/universe.h
+++ b/src/universe.h
@@ -37,7 +37,7 @@ class Universe : protected Pointers {
                      // proc uni2orig[I] in original communicator
 
   Universe(class LAMMPS *, MPI_Comm);
-  ~Universe();
+  ~Universe() override;
   void reorder(char *, char *);
   void add_world(char *);
   int consistent();