diff --git a/src/ViewportWidget.cpp b/src/ViewportWidget.cpp
index 01a66be..2a9d0c9 100644
--- a/src/ViewportWidget.cpp
+++ b/src/ViewportWidget.cpp
@@ -114,8 +114,10 @@ void ViewportWidget::initializeGL()
 
 void ViewportWidget::paintGL()
 {
+    const qreal retinaScale = devicePixelRatio();
+
     // Main scene rendering
-    glViewport(0, 0, width(), height());
+    glViewport(0, 0, width() * retinaScale, height() * retinaScale);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
     if (!m_shaderProgram || !m_shaderProgram->isLinked()) {
@@ -189,9 +191,9 @@ void ViewportWidget::paintGL()
     QMatrix4x4 viewCubeModel;
     viewCubeModel.rotate(m_camera->xRotation() / 16.0f, 1, 0, 0);
     viewCubeModel.rotate(m_camera->yRotation() / 16.0f, 0, 1, 0);
-    m_viewCube->paintGL(m_shaderProgram, m_colorLoc, viewCubeModel, width(), height());
+    m_viewCube->paintGL(m_shaderProgram, m_colorLoc, viewCubeModel, width() * retinaScale, height() * retinaScale);
 
-    glViewport(0, 0, width(), height());
+    glViewport(0, 0, width() * retinaScale, height() * retinaScale);
     glDisable(GL_DEPTH_TEST);
     glDisable(GL_CULL_FACE);