diff --git a/src/util/error.cpp b/src/util/error.cpp
index 6e5fa4bf..bfb211f3 100644
--- a/src/util/error.cpp
+++ b/src/util/error.cpp
@@ -61,7 +61,7 @@ String Error::what() const {
       const wxString& GetStackTrace() const { return m_stackTrace; }
 
     protected:
-      virtual void OnStackFrame(const wxStackFrame& frame) {
+      void OnStackFrame(const wxStackFrame& frame) override {
         m_stackTrace << wxString::Format(_("[%02d] "), frame.GetLevel());
 
         wxString name = frame.GetName();
diff --git a/src/util/file_utils.cpp b/src/util/file_utils.cpp
index f1d465a3..ba494891 100644
--- a/src/util/file_utils.cpp
+++ b/src/util/file_utils.cpp
@@ -158,7 +158,7 @@ public:
     }
   }
   
-  wxDirTraverseResult OnFile(const String& filename) {
+  wxDirTraverseResult OnFile(const String& filename) override {
     if (!remove_file(filename)) {
       ok = false;
       handle_error(_("Cannot delete ") + filename + _("\n")
@@ -167,7 +167,7 @@ public:
     }
     return wxDIR_CONTINUE;
   }
-  wxDirTraverseResult OnDir(const String& dirname) {
+  wxDirTraverseResult OnDir(const String& dirname) override {
     to_delete.push_back(dirname);
     return wxDIR_CONTINUE;
   }
@@ -210,11 +210,11 @@ public:
   IgnoredMover(const String& from, const String& to)
     : from(from), to(to)
   {}
-  wxDirTraverseResult OnFile(const String& filename) {
+  wxDirTraverseResult OnFile(const String& filename) override {
     tryMove(filename);
     return wxDIR_CONTINUE;
   }
-  wxDirTraverseResult OnDir(const String& dirname) {
+  wxDirTraverseResult OnDir(const String& dirname) override {
     return tryMove(dirname) ? wxDIR_IGNORE : wxDIR_CONTINUE;
   }
 private: