diff --git a/src/ntopo.h b/src/ntopo.h
index 9d8fe988fb..8015054490 100644
--- a/src/ntopo.h
+++ b/src/ntopo.h
@@ -24,7 +24,7 @@ class NTopo : protected Pointers {
   int **bondlist, **anglelist, **dihedrallist, **improperlist;
 
   NTopo(class LAMMPS *);
-  virtual ~NTopo();
+  ~NTopo() override;
 
   virtual void build() = 0;
 
diff --git a/src/ntopo_angle_all.h b/src/ntopo_angle_all.h
index ec8d08dd1c..8ef0d17c3b 100644
--- a/src/ntopo_angle_all.h
+++ b/src/ntopo_angle_all.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoAngleAll : public NTopo {
  public:
   NTopoAngleAll(class LAMMPS *);
-  ~NTopoAngleAll() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/ntopo_angle_partial.h b/src/ntopo_angle_partial.h
index ee29a9dd98..6d12975948 100644
--- a/src/ntopo_angle_partial.h
+++ b/src/ntopo_angle_partial.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoAnglePartial : public NTopo {
  public:
   NTopoAnglePartial(class LAMMPS *);
-  ~NTopoAnglePartial() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/ntopo_angle_template.h b/src/ntopo_angle_template.h
index cfd48b0450..027659fde3 100644
--- a/src/ntopo_angle_template.h
+++ b/src/ntopo_angle_template.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoAngleTemplate : public NTopo {
  public:
   NTopoAngleTemplate(class LAMMPS *);
-  ~NTopoAngleTemplate() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/ntopo_bond_all.h b/src/ntopo_bond_all.h
index de404446e8..a62fc5f43c 100644
--- a/src/ntopo_bond_all.h
+++ b/src/ntopo_bond_all.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoBondAll : public NTopo {
  public:
   NTopoBondAll(class LAMMPS *);
-  ~NTopoBondAll() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/ntopo_bond_partial.h b/src/ntopo_bond_partial.h
index 4d334d1f0f..e0181e4491 100644
--- a/src/ntopo_bond_partial.h
+++ b/src/ntopo_bond_partial.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoBondPartial : public NTopo {
  public:
   NTopoBondPartial(class LAMMPS *);
-  ~NTopoBondPartial() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/ntopo_bond_template.h b/src/ntopo_bond_template.h
index b725ac85f9..5899ded8b0 100644
--- a/src/ntopo_bond_template.h
+++ b/src/ntopo_bond_template.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoBondTemplate : public NTopo {
  public:
   NTopoBondTemplate(class LAMMPS *);
-  ~NTopoBondTemplate() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/ntopo_dihedral_all.h b/src/ntopo_dihedral_all.h
index 0568bc9708..002c11a385 100644
--- a/src/ntopo_dihedral_all.h
+++ b/src/ntopo_dihedral_all.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoDihedralAll : public NTopo {
  public:
   NTopoDihedralAll(class LAMMPS *);
-  ~NTopoDihedralAll() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/ntopo_dihedral_partial.h b/src/ntopo_dihedral_partial.h
index f439fe1dcd..c75b52fa44 100644
--- a/src/ntopo_dihedral_partial.h
+++ b/src/ntopo_dihedral_partial.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoDihedralPartial : public NTopo {
  public:
   NTopoDihedralPartial(class LAMMPS *);
-  ~NTopoDihedralPartial() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/ntopo_dihedral_template.h b/src/ntopo_dihedral_template.h
index 67fe1c9072..e9bb1e355a 100644
--- a/src/ntopo_dihedral_template.h
+++ b/src/ntopo_dihedral_template.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoDihedralTemplate : public NTopo {
  public:
   NTopoDihedralTemplate(class LAMMPS *);
-  ~NTopoDihedralTemplate() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/ntopo_improper_all.h b/src/ntopo_improper_all.h
index 26bbb1a642..af8d10cb44 100644
--- a/src/ntopo_improper_all.h
+++ b/src/ntopo_improper_all.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoImproperAll : public NTopo {
  public:
   NTopoImproperAll(class LAMMPS *);
-  ~NTopoImproperAll() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/ntopo_improper_partial.h b/src/ntopo_improper_partial.h
index cc4baf1642..da88d81a41 100644
--- a/src/ntopo_improper_partial.h
+++ b/src/ntopo_improper_partial.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoImproperPartial : public NTopo {
  public:
   NTopoImproperPartial(class LAMMPS *);
-  ~NTopoImproperPartial() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/ntopo_improper_template.h b/src/ntopo_improper_template.h
index 510f067d66..1a1a4ade23 100644
--- a/src/ntopo_improper_template.h
+++ b/src/ntopo_improper_template.h
@@ -27,8 +27,7 @@ namespace LAMMPS_NS {
 class NTopoImproperTemplate : public NTopo {
  public:
   NTopoImproperTemplate(class LAMMPS *);
-  ~NTopoImproperTemplate() {}
-  void build();
+  void build() override;
 };
 
 }    // namespace LAMMPS_NS