diff --git a/Lab/demo/Lab/MainWindow.cpp b/Lab/demo/Lab/MainWindow.cpp
index 909a130e46d..dd133dbf44f 100644
--- a/Lab/demo/Lab/MainWindow.cpp
+++ b/Lab/demo/Lab/MainWindow.cpp
@@ -2644,17 +2644,10 @@ void MainWindow::resetHeader()
   sceneView->header()->setSectionResizeMode(Scene::RenderingModeColumn, QHeaderView::ResizeToContents);
   sceneView->header()->setSectionResizeMode(Scene::ABColumn, QHeaderView::Fixed);
   sceneView->header()->setSectionResizeMode(Scene::VisibleColumn, QHeaderView::Fixed);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 11, 0)
   sceneView->header()->resizeSection(Scene::ColorColumn, sceneView->header()->fontMetrics().horizontalAdvance("_#_"));
   sceneView->resizeColumnToContents(Scene::RenderingModeColumn);
   sceneView->header()->resizeSection(Scene::ABColumn, sceneView->header()->fontMetrics().horizontalAdvance(QString("_AB_")));
   sceneView->header()->resizeSection(Scene::VisibleColumn, sceneView->header()->fontMetrics().horizontalAdvance(QString("_View_")));
-#else
-  sceneView->header()->resizeSection(Scene::ColorColumn, sceneView->header()->fontMetrics().width("_#_"));
-  sceneView->resizeColumnToContents(Scene::RenderingModeColumn);
-  sceneView->header()->resizeSection(Scene::ABColumn, sceneView->header()->fontMetrics().width(QString("_AB_")));
-  sceneView->header()->resizeSection(Scene::VisibleColumn, sceneView->header()->fontMetrics().width(QString("_View_")));
-#endif
 }
 
 void MainWindow::reset_default_loaders()
diff --git a/Lab/demo/Lab/Plugins/Mesh_3/Io_image_plugin.cpp b/Lab/demo/Lab/Plugins/Mesh_3/Io_image_plugin.cpp
index 4720d8aa35b..780511846aa 100644
--- a/Lab/demo/Lab/Plugins/Mesh_3/Io_image_plugin.cpp
+++ b/Lab/demo/Lab/Plugins/Mesh_3/Io_image_plugin.cpp
@@ -705,11 +705,7 @@ private:
 
       // Find the right width for the label to accommodate at least 9999
       QFontMetrics metric = x_cubeLabel->fontMetrics();
-#if QT_VERSION >= QT_VERSION_CHECK(5, 11, 0)
       x_cubeLabel->setFixedWidth(metric.horizontalAdvance(QString(".9999.")));
-#else
-      x_cubeLabel->setFixedWidth(metric.width(QString(".9999.")));
-#endif
       x_cubeLabel->setText("0");
       x_cubeLabel->setValidator(validator);
 
@@ -735,11 +731,7 @@ private:
 
       // Find the right width for the label to accommodate at least 9999
       QFontMetrics metric = y_cubeLabel->fontMetrics();
-#if QT_VERSION >= QT_VERSION_CHECK(5, 11, 0)
       y_cubeLabel->setFixedWidth(metric.horizontalAdvance(QString(".9999.")));
-#else
-      y_cubeLabel->setFixedWidth(metric.width(QString(".9999.")));
-#endif
       y_cubeLabel->setText("0");
       y_cubeLabel->setValidator(validator);
       y_slider = new QSlider(mw);
@@ -764,11 +756,7 @@ private:
 
       // Find the right width for the label to accommodate at least 9999
       QFontMetrics metric = z_cubeLabel->fontMetrics();
-#if QT_VERSION >= QT_VERSION_CHECK(5, 11, 0)
       z_cubeLabel->setFixedWidth(metric.horizontalAdvance(QString(".9999.")));
-#else
-      z_cubeLabel->setFixedWidth(metric.width(QString(".9999.")));
-#endif
       z_cubeLabel->setText("0");
       z_cubeLabel->setValidator(validator);
       z_slider = new QSlider(mw);
diff --git a/Lab/demo/Lab/Plugins/PMP/Engrave_text_plugin.cpp b/Lab/demo/Lab/Plugins/PMP/Engrave_text_plugin.cpp
index 27a3ba46f0d..1adc2ae81ea 100644
--- a/Lab/demo/Lab/Plugins/PMP/Engrave_text_plugin.cpp
+++ b/Lab/demo/Lab/Plugins/PMP/Engrave_text_plugin.cpp
@@ -250,11 +250,7 @@ protected:
     }
     case QEvent::Wheel: {
       QWheelEvent* event = static_cast<QWheelEvent*>(ev);
-#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
-      QPoint pos = event->pos();
-#else
       QPointF pos = event->position();
-#endif
       QPointF old_pos = v->mapToScene(pos.x(), pos.y());
       if(event->angleDelta().y() <0)
         v->scale(1.2, 1.2);
diff --git a/Lab/demo/Lab/Plugins/Surface_mesh/Parameterization_plugin.cpp b/Lab/demo/Lab/Plugins/Surface_mesh/Parameterization_plugin.cpp
index d9ec9149133..38d593c2b40 100644
--- a/Lab/demo/Lab/Plugins/Surface_mesh/Parameterization_plugin.cpp
+++ b/Lab/demo/Lab/Plugins/Surface_mesh/Parameterization_plugin.cpp
@@ -142,11 +142,7 @@ protected:
     }
     case QEvent::Wheel: {
       QWheelEvent* event = static_cast<QWheelEvent*>(ev);
-#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
-      QPoint pos = event->pos();
-#else
       QPointF pos = event->position();
-#endif
       QPointF old_pos = v->mapToScene(pos.x(), pos.y());
       if(event->angleDelta().y() <0)
         v->scale(1.2, 1.2);
diff --git a/Lab/demo/Lab/Viewer.cpp b/Lab/demo/Lab/Viewer.cpp
index 70c2b60e838..b93cb2cb7b1 100644
--- a/Lab/demo/Lab/Viewer.cpp
+++ b/Lab/demo/Lab/Viewer.cpp
@@ -1152,13 +1152,7 @@ void Viewer::drawVisualHints()
     //Prints the displayMessage
     QFont font = QFont();
     QFontMetrics fm(font);
-    TextItem *message_text = new TextItem(float(10 +
-                                            #if QT_VERSION >= QT_VERSION_CHECK(5, 11, 0)
-                                                   fm.horizontalAdvance(d->message)/2)
-                                            #else
-                                                   fm.width(d->message)/2)
-                                            #endif
-                                          ,
+    TextItem *message_text = new TextItem(float(10 + fm.horizontalAdvance(d->message)/2),
                                           float(height()-20),
                                           0, d->message, false,
                                           QFont(), Qt::gray );
diff --git a/Three/include/CGAL/Three/TextRenderer.h b/Three/include/CGAL/Three/TextRenderer.h
index c5c729ec032..f04535841f7 100644
--- a/Three/include/CGAL/Three/TextRenderer.h
+++ b/Three/include/CGAL/Three/TextRenderer.h
@@ -52,12 +52,7 @@ public :
         :x(p_x), y(p_y), z(p_z),_3D(p_3D), _is_always_visible(always_visible), m_text(p_text), m_font(font), m_color(p_color)
     {
        QFontMetrics fm(m_font);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 11, 0)
        _width = float(fm.horizontalAdvance(m_text)+2);
-#else
-       _width = float(fm.width(m_text)+2);
-#endif
-
        _height = float(fm.height());
     }
     //!\brief Accessor for the string
diff --git a/Three/include/CGAL/Three/Three.h b/Three/include/CGAL/Three/Three.h
index 3dac95792a3..e3e6366d5b6 100644
--- a/Three/include/CGAL/Three/Three.h
+++ b/Three/include/CGAL/Three/Three.h
@@ -31,11 +31,7 @@
 #  define THREE_EXPORT Q_DECL_IMPORT
 #endif
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
-#define CGAL_QT_SKIP_EMPTY_PARTS QString::SkipEmptyParts
-#else
 #define CGAL_QT_SKIP_EMPTY_PARTS ::Qt::SkipEmptyParts
-#endif
 
 namespace CGAL{
 namespace Three{