diff --git a/app/configappearancewidget.h b/app/configappearancewidget.h
index 7bf7dec..ab17de0 100644
--- a/app/configappearancewidget.h
+++ b/app/configappearancewidget.h
@@ -59,7 +59,7 @@ private Q_SLOTS:
     void showColorDialog();
 
 private:
-    void showEvent(QShowEvent *);
+    void showEvent(QShowEvent *) override;
     void setHighlightedForeground(const QString &colorName);
     void setItemToolTip(QTableWidgetItem *item, const QFont &font);
 
diff --git a/app/configdialog.h b/app/configdialog.h
index b4875d1..0d918ab 100644
--- a/app/configdialog.h
+++ b/app/configdialog.h
@@ -46,10 +46,10 @@ class ConfigDialog : public PageDialog
     void settingsChanged();
 
 private Q_SLOTS:
-    void accept();
+    void accept() override;
 
 private:
-    void keyPressEvent(QKeyEvent *event);
+    void keyPressEvent(QKeyEvent *event) override;
 
     ConfigAppearanceWidget *m_configAppearanceWidget;
     ConfigEditorWidget *m_configEditorWidget;
diff --git a/app/editgotolinewidget.h b/app/editgotolinewidget.h
index 33da2e7..f817980 100644
--- a/app/editgotolinewidget.h
+++ b/app/editgotolinewidget.h
@@ -39,7 +39,7 @@ public Q_SLOTS:
     void focusEditor();
 
 protected:
-    virtual void keyPressEvent(QKeyEvent *event);
+    virtual void keyPressEvent(QKeyEvent *event) override;
 
 protected Q_SLOTS:
     void hide();
diff --git a/app/editindentwidget.h b/app/editindentwidget.h
index 60f19cf..6becf53 100644
--- a/app/editindentwidget.h
+++ b/app/editindentwidget.h
@@ -38,8 +38,8 @@ class IndentWidget : public QWidget
     void hidden();
 
 protected:
-    virtual void showEvent(QShowEvent *event);
-    virtual void keyPressEvent(QKeyEvent *event);
+    virtual void showEvent(QShowEvent *event) override;
+    virtual void keyPressEvent(QKeyEvent *event) override;
 
 private Q_SLOTS:
     void indent();
diff --git a/app/editreplacecurrentwidget.h b/app/editreplacecurrentwidget.h
index 800bd55..09efc47 100644
--- a/app/editreplacecurrentwidget.h
+++ b/app/editreplacecurrentwidget.h
@@ -41,8 +41,8 @@ class ReplaceCurrentWidget : public QWidget
     void hidden();
 
 protected:
-    virtual void showEvent(QShowEvent *event);
-    virtual void keyPressEvent(QKeyEvent *event);
+    virtual void showEvent(QShowEvent *event) override;
+    virtual void keyPressEvent(QKeyEvent *event) override;
 
 protected Q_SLOTS:
     void hide();
diff --git a/app/editreplacewidget.h b/app/editreplacewidget.h
index 94e84f0..0cdb3e3 100644
--- a/app/editreplacewidget.h
+++ b/app/editreplacewidget.h
@@ -41,8 +41,8 @@ public Q_SLOTS:
     void replace(const QString &text, const QString &replacement, QTextDocument::FindFlags flags);
 
 protected:
-    virtual void showEvent(QShowEvent *event);
-    virtual void keyPressEvent(QKeyEvent *event);
+    virtual void showEvent(QShowEvent *event) override;
+    virtual void keyPressEvent(QKeyEvent *event) override;
 
 protected Q_SLOTS:
     void hide();
diff --git a/app/linenumberwidget.h b/app/linenumberwidget.h
index a6284f7..56f702d 100644
--- a/app/linenumberwidget.h
+++ b/app/linenumberwidget.h
@@ -29,12 +29,12 @@ class LineNumberWidget : public QWidget
     Q_OBJECT
 public:
     explicit LineNumberWidget(TikzEditor *editor);
-    QSize sizeHint() const;
+    QSize sizeHint() const override;
 
 protected:
-    virtual void paintEvent(QPaintEvent *event);
-    virtual void mousePressEvent(QMouseEvent *event);
-    virtual void mouseReleaseEvent(QMouseEvent *);
+    virtual void paintEvent(QPaintEvent *event) override;
+    virtual void mousePressEvent(QMouseEvent *event) override;
+    virtual void mouseReleaseEvent(QMouseEvent *) override;
 
 private:
     TikzEditor *m_editor;
diff --git a/app/loghighlighter.h b/app/loghighlighter.h
index d13cae2..901767d 100644
--- a/app/loghighlighter.h
+++ b/app/loghighlighter.h
@@ -39,7 +39,7 @@ class LogHighlighter : public QSyntaxHighlighter
     /** Implements QSyntaxHighlighter::highlightBlock()
      * @see QSyntaxHighlighter::highlightBlock()
      */
-    void highlightBlock(const QString &text);
+    void highlightBlock(const QString &text) override;
 
 private:
     struct LogHighlightingRule
diff --git a/app/logtextedit.h b/app/logtextedit.h
index 661e2a9..8f78c58 100644
--- a/app/logtextedit.h
+++ b/app/logtextedit.h
@@ -31,7 +31,7 @@ class LogTextEdit : public QTextEdit
 public:
     explicit LogTextEdit(QWidget *parent = 0);
     ~LogTextEdit();
-    virtual QSize sizeHint() const;
+    virtual QSize sizeHint() const override;
 
 public Q_SLOTS:
     void updateLog(const QString &logText);
diff --git a/app/mainwindow.h b/app/mainwindow.h
index 04f4dee..02c7391 100644
--- a/app/mainwindow.h
+++ b/app/mainwindow.h
@@ -80,10 +80,10 @@ class MainWindow : public QMainWindow, public MainWidget
     MainWindow();
     virtual ~MainWindow();
 
-    virtual QWidget *widget();
+    virtual QWidget *widget() override;
     bool isDocumentModified() const;
-    QString tikzCode() const;
-    QUrl url() const;
+    QString tikzCode() const override;
+    QUrl url() const override;
     void setLineNumber(int lineNumber);
     int lineNumber() const;
 
@@ -99,11 +99,11 @@ public Q_SLOTS:
 
 protected:
 #ifdef KTIKZ_USE_KDE
-    bool queryClose();
-    void readProperties(const KConfigGroup &group);
-    void saveProperties(KConfigGroup &group);
+    bool queryClose() override;
+    void readProperties(const KConfigGroup &group) override;
+    void saveProperties(KConfigGroup &group) override;
 #endif
-    void closeEvent(QCloseEvent *event);
+    void closeEvent(QCloseEvent *event) override;
 
 private Q_SLOTS:
     void init();
diff --git a/app/tikzcommandwidget.h b/app/tikzcommandwidget.h
index 5f594c0..7376c83 100644
--- a/app/tikzcommandwidget.h
+++ b/app/tikzcommandwidget.h
@@ -28,7 +28,7 @@ class TikzCommandWidget : public QWidget
 
 public:
     explicit TikzCommandWidget(QWidget *parent = 0);
-    virtual QSize sizeHint() const;
+    virtual QSize sizeHint() const override;
 };
 
 #endif
diff --git a/app/tikzeditor.h b/app/tikzeditor.h
index 08aeff0..b26ce43 100644
--- a/app/tikzeditor.h
+++ b/app/tikzeditor.h
@@ -69,12 +69,12 @@ public Q_SLOTS:
     void tabIndent(bool isUnindenting);
 
 protected:
-    void paintEvent(QPaintEvent *event);
-    void keyPressEvent(QKeyEvent *event);
-    void focusInEvent(QFocusEvent *event);
-    void focusOutEvent(QFocusEvent *event);
+    void paintEvent(QPaintEvent *event) override;
+    void keyPressEvent(QKeyEvent *event) override;
+    void focusInEvent(QFocusEvent *event) override;
+    void focusOutEvent(QFocusEvent *event) override;
     int lineNumberAreaWidth();
-    void resizeEvent(QResizeEvent *event);
+    void resizeEvent(QResizeEvent *event) override;
 
 private Q_SLOTS:
     void highlightCurrentLine();
diff --git a/app/tikzeditorhighlighter.h b/app/tikzeditorhighlighter.h
index 99edee5..6db5ee3 100644
--- a/app/tikzeditorhighlighter.h
+++ b/app/tikzeditorhighlighter.h
@@ -52,7 +52,7 @@ class TikzHighlighter : public QSyntaxHighlighter
     /** Implements QSyntaxHighlighter::highlightBlock()
      * @see QSyntaxHighlighter::highlightBlock()
      */
-    void highlightBlock(const QString &text);
+    void highlightBlock(const QString &text) override;
 
 private:
     /// All highlighting rules with their formatting for easy iteration
diff --git a/app/tikzeditorview.h b/app/tikzeditorview.h
index a6132de..097fba0 100644
--- a/app/tikzeditorview.h
+++ b/app/tikzeditorview.h
@@ -47,7 +47,7 @@ class TikzEditorView : public TikzEditorViewAbstract
 
     QPlainTextEdit *editor();
     QTextDocument *document();
-    QString text();
+    QString text() override;
 #ifndef KTIKZ_USE_KDE
     QMenu *editMenu();
     QMenu *bookmarksMenu();
@@ -56,11 +56,11 @@ class TikzEditorView : public TikzEditorViewAbstract
     void applySettings();
     void setLine(const QString &line);
     int lineNumber() const;
-    void updateCompleter(bool useCompletion, const QStringList &words);
-    void clear();
-    bool isEmpty();
-    bool isModified();
-    void setModified(bool value);
+    void updateCompleter(bool useCompletion, const QStringList &words) override;
+    void clear() override;
+    bool isEmpty() override;
+    bool isModified() override;
+    void setModified(bool value) override;
 
 public Q_SLOTS:
     void setPasteEnabled();
diff --git a/app/tikzktexteditorcompletion.h b/app/tikzktexteditorcompletion.h
index 39213f9..623aaa6 100644
--- a/app/tikzktexteditorcompletion.h
+++ b/app/tikzktexteditorcompletion.h
@@ -47,16 +47,12 @@ class TikzKTextEditorCompletion : public KTextEditor::CodeCompletionModel,
 
     void updateCompleter(bool useCompletion, const QStringList &words);
 
-    // bool shouldStartCompletion(KTextEditor::View *view, const QString &insertedText, bool
-    // userInsertion, const KTextEditor::Cursor &position) Q_DECL_OVERRIDE;
     KTextEditor::Range completionRange(KTextEditor::View *view,
-                                       const KTextEditor::Cursor &position) Q_DECL_OVERRIDE;
-    // QString filterString(KTextEditor::View *view, const KTextEditor::Range &range, const
-    // KTextEditor::Cursor &position) Q_DECL_OVERRIDE;
+                                       const KTextEditor::Cursor &position) override;
 
     void completionInvoked(KTextEditor::View *view, const KTextEditor::Range &range,
-                           KTextEditor::CodeCompletionModel::InvocationType it) Q_DECL_OVERRIDE;
-    QVariant data(const QModelIndex &index, int role) const Q_DECL_OVERRIDE;
+                           KTextEditor::CodeCompletionModel::InvocationType it) override;
+    QVariant data(const QModelIndex &index, int role) const override;
 
 private:
     void findMatches();
diff --git a/app/tikzktexteditorview.h b/app/tikzktexteditorview.h
index 043b9da..3cb01df 100644
--- a/app/tikzktexteditorview.h
+++ b/app/tikzktexteditorview.h
@@ -39,14 +39,14 @@ class TikzKTextEditorView : public TikzEditorViewAbstract
 
     KTextEditor::Document *editor();
     KTextEditor::Document *document();
-    QString text();
+    QString text() override;
     KTextEditor::View *view();
 
-    void updateCompleter(bool useCompletion, const QStringList &words);
-    void clear();
-    bool isEmpty();
-    bool isModified();
-    void setModified(bool value);
+    void updateCompleter(bool useCompletion, const QStringList &words) override;
+    void clear() override;
+    bool isEmpty() override;
+    bool isModified() override;
+    void setModified(bool value) override;
 
 Q_SIGNALS:
     void documentUrlChanged(const QUrl &url);
diff --git a/app/usercommandeditdialog.h b/app/usercommandeditdialog.h
index 0453444..f2c33d2 100644
--- a/app/usercommandeditdialog.h
+++ b/app/usercommandeditdialog.h
@@ -33,7 +33,7 @@ class UserCommandEditDialog : public QDialog
     Ui::UserCommandEditDialog ui;
 
 public Q_SLOTS:
-    void accept();
+    void accept() override;
 
 private Q_SLOTS:
     void readSettings();
diff --git a/common/templatewidget.h b/common/templatewidget.h
index 6371716..b262d91 100644
--- a/common/templatewidget.h
+++ b/common/templatewidget.h
@@ -41,7 +41,7 @@ class TemplateWidget : public QWidget
     void focusEditor();
 
 protected:
-    void keyPressEvent(QKeyEvent *event);
+    void keyPressEvent(QKeyEvent *event) override;
 
 private Q_SLOTS:
     void selectTemplateFile();
diff --git a/common/tikzpreview.h b/common/tikzpreview.h
index 5a2d005..8e1d689 100644
--- a/common/tikzpreview.h
+++ b/common/tikzpreview.h
@@ -43,7 +43,7 @@ class TikzPreview : public QGraphicsView
     explicit TikzPreview(QWidget *parent = 0);
     ~TikzPreview();
 
-    virtual QSize sizeHint() const;
+    virtual QSize sizeHint() const override;
     QList<QAction *> actions();
     QToolBar *toolBar();
     QImage renderToImage(double xres, double yres, int pageNumber);
@@ -67,11 +67,11 @@ public Q_SLOTS:
     void generatePreview(Poppler::Document *tikzPdfDoc, qreal zoomFactor, int currentPage);
 
 protected:
-    void contextMenuEvent(QContextMenuEvent *event);
-    void paintEvent(QPaintEvent *event);
-    void wheelEvent(QWheelEvent *event);
-    void mouseMoveEvent(QMouseEvent *event);
-    void mousePressEvent(QMouseEvent *event);
+    void contextMenuEvent(QContextMenuEvent *event) override;
+    void paintEvent(QPaintEvent *event) override;
+    void wheelEvent(QWheelEvent *event) override;
+    void mouseMoveEvent(QMouseEvent *event) override;
+    void mousePressEvent(QMouseEvent *event) override;
 
 private Q_SLOTS:
     void setZoomFactor(qreal zoomFactor);
diff --git a/common/tikzpreviewmessagewidget.h b/common/tikzpreviewmessagewidget.h
index fe07cc3..50542ef 100644
--- a/common/tikzpreviewmessagewidget.h
+++ b/common/tikzpreviewmessagewidget.h
@@ -34,7 +34,7 @@ class TikzPreviewMessageWidget : public QFrame
     explicit TikzPreviewMessageWidget(QWidget *parent = 0);
     ~TikzPreviewMessageWidget();
 
-    virtual QSize sizeHint() const;
+    virtual QSize sizeHint() const override;
     void setText(const QString &message, PixmapVisibility pixmapVisibility = PixmapNotVisible);
 
 private:
diff --git a/common/utils/printpreviewdialog.h b/common/utils/printpreviewdialog.h
index 5d19fd8..a9160d6 100644
--- a/common/utils/printpreviewdialog.h
+++ b/common/utils/printpreviewdialog.h
@@ -32,7 +32,7 @@ class PrintPreviewDialog : public QDialog
 public:
     explicit PrintPreviewDialog(QPrinter *printer, QWidget *parent = 0);
 
-    void setVisible(bool visible);
+    void setVisible(bool visible) override;
 
 Q_SIGNALS:
     void paintRequested(QPrinter *printer);
diff --git a/part/part.h b/part/part.h
index 04dd463..2960c78 100644
--- a/part/part.h
+++ b/part/part.h
@@ -43,17 +43,17 @@ class Part : public KParts::ReadOnlyPart, public MainWidget
 
 public:
     explicit Part(QWidget *parentWidget, QObject *parent, const QVariantList &args);
-    virtual ~Part() Q_DECL_OVERRIDE;
+    virtual ~Part() override;
 
     static KAboutData *createAboutData();
-    virtual QWidget *widget();
-    QString tikzCode() const;
-    QUrl url() const;
+    virtual QWidget *widget() override;
+    QString tikzCode() const override;
+    QUrl url() const override;
 
 protected:
     /** Reimplemented from KParts::PartBase. */
-    bool openFile() Q_DECL_OVERRIDE;
-    bool closeUrl();
+    bool openFile() override;
+    bool closeUrl() override;
 
 private slots:
     void showAboutDialog();