diff --git a/src/App/Application.cpp b/src/App/Application.cpp
index 75d9d621eeef..7c200f0e18ab 100644
--- a/src/App/Application.cpp
+++ b/src/App/Application.cpp
@@ -1211,6 +1211,7 @@ void printBacktrace(size_t skip=0)
 void segmentation_fault_handler(int sig)
 {
 #if defined(FC_OS_LINUX)
+    (void)sig;
     std::cerr << "Program received signal SIGSEGV, Segmentation fault.\n";
     printBacktrace(2);
     exit(1);
diff --git a/src/Mod/TechDraw/Gui/QGICMark.h b/src/Mod/TechDraw/Gui/QGICMark.h
index dcec3dd293dd..eb6f3f2626fe 100644
--- a/src/Mod/TechDraw/Gui/QGICMark.h
+++ b/src/Mod/TechDraw/Gui/QGICMark.h
@@ -35,8 +35,8 @@ class TechDrawGuiExport QGICMark : public QGIVertex
     ~QGICMark() {}
 
     enum {Type = QGraphicsItem::UserType + 171};
-    int type() const { return Type;}
-    virtual void paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0 );
+    int type() const override { return Type;}
+    virtual void paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0 ) override;
 
     virtual QRectF boundingRect() const override;
     virtual QPainterPath shape() const override;
@@ -48,7 +48,7 @@ class TechDrawGuiExport QGICMark : public QGIVertex
     void setSize(float s);
     float getThick() { return m_width; }
     void setThick(float t);
-    virtual void setPrettyNormal();
+    virtual void setPrettyNormal() override;
 
     double getMarkFuzz(void) const;
 
diff --git a/src/Mod/TechDraw/Gui/QGIVertex.h b/src/Mod/TechDraw/Gui/QGIVertex.h
index 5cd90e41aa56..8c8c79cc8c22 100644
--- a/src/Mod/TechDraw/Gui/QGIVertex.h
+++ b/src/Mod/TechDraw/Gui/QGIVertex.h
@@ -35,8 +35,8 @@ class TechDrawGuiExport QGIVertex : public QGIPrimPath
     ~QGIVertex() {}
 
     enum {Type = QGraphicsItem::UserType + 105};
-    int type() const { return Type;}
-    virtual void paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0 );
+    int type() const override { return Type;}
+    virtual void paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0 ) override;
 
     int getProjIndex() const { return projIndex; }
 
diff --git a/src/Mod/TechDraw/Gui/QGVPage.h b/src/Mod/TechDraw/Gui/QGVPage.h
index 98489e3d1123..54307be5f577 100644
--- a/src/Mod/TechDraw/Gui/QGVPage.h
+++ b/src/Mod/TechDraw/Gui/QGVPage.h
@@ -61,7 +61,7 @@ class TechDrawGuiExport QGVPage : public QGraphicsView
     virtual ~QGVPage();
 
     void setRenderer(RendererType type = Native);
-    void drawBackground(QPainter *p, const QRectF &rect);
+    void drawBackground(QPainter *p, const QRectF &rect) override;
 
     QGIView * addViewDimension(TechDraw::DrawViewDimension *dim);
     QGIView * addProjectionGroup(TechDraw::DrawProjGroup *view);
@@ -108,11 +108,11 @@ public Q_SLOTS:
     void setHighQualityAntialiasing(bool highQualityAntialiasing);
 
 protected:
-    void wheelEvent(QWheelEvent *event);
-    void paintEvent(QPaintEvent *event);
-    void enterEvent(QEvent *event);
-    void mousePressEvent(QMouseEvent *event);
-    void mouseReleaseEvent(QMouseEvent *event);
+    void wheelEvent(QWheelEvent *event) override;
+    void paintEvent(QPaintEvent *event) override;
+    void enterEvent(QEvent *event) override;
+    void mousePressEvent(QMouseEvent *event) override;
+    void mouseReleaseEvent(QMouseEvent *event) override;
     void keyPressEvent(QKeyEvent *event) override;
     void kbPanScroll(int xMove = 1, int yMove = 1);