diff --git a/src/reader.h b/src/reader.h
index 097fa2526b..6429cd40de 100644
--- a/src/reader.h
+++ b/src/reader.h
@@ -23,7 +23,7 @@ namespace LAMMPS_NS {
 class Reader : protected Pointers {
  public:
   Reader(class LAMMPS *);
-  virtual ~Reader() {}
+  ~Reader() override {}
 
   virtual void settings(int, char **);
 
diff --git a/src/reader_native.h b/src/reader_native.h
index f888509dfb..6566df0680 100644
--- a/src/reader_native.h
+++ b/src/reader_native.h
@@ -32,13 +32,13 @@ namespace LAMMPS_NS {
 class ReaderNative : public Reader {
  public:
   ReaderNative(class LAMMPS *);
-  ~ReaderNative();
+  ~ReaderNative() override;
 
-  int read_time(bigint &);
-  void skip();
+  int read_time(bigint &) override;
+  void skip() override;
   bigint read_header(double[3][3], int &, int &, int, int, int *, char **, int, int, int &, int &,
-                     int &, int &);
-  void read_atoms(int, int, double **);
+                     int &, int &) override;
+  void read_atoms(int, int, double **) override;
 
  private:
   int revision;
diff --git a/src/reader_xyz.h b/src/reader_xyz.h
index 0807be719e..9a1478a0c6 100644
--- a/src/reader_xyz.h
+++ b/src/reader_xyz.h
@@ -29,13 +29,13 @@ namespace LAMMPS_NS {
 class ReaderXYZ : public Reader {
  public:
   ReaderXYZ(class LAMMPS *);
-  ~ReaderXYZ();
+  ~ReaderXYZ() override;
 
-  int read_time(bigint &);
-  void skip();
+  int read_time(bigint &) override;
+  void skip() override;
   bigint read_header(double[3][3], int &, int &, int, int, int *, char **, int, int, int &, int &,
-                     int &, int &);
-  void read_atoms(int, int, double **);
+                     int &, int &) override;
+  void read_atoms(int, int, double **) override;
 
  private:
   char *line;       // line read from dump file
diff --git a/src/tokenizer.h b/src/tokenizer.h
index 060e1bf6e3..0b6d773aad 100644
--- a/src/tokenizer.h
+++ b/src/tokenizer.h
@@ -62,11 +62,11 @@ class TokenizerException : public std::exception {
    * \param  token  String of the token/word that caused the error */
   explicit TokenizerException(const std::string &msg, const std::string &token);
 
-  ~TokenizerException() noexcept {}
+  ~TokenizerException() noexcept override {}
 
   /** Retrieve message describing the thrown exception
    * \return string with error message */
-  virtual const char *what() const noexcept { return message.c_str(); }
+  const char *what() const noexcept override { return message.c_str(); }
 };
 
 class InvalidIntegerException : public TokenizerException {