diff --git a/examples/opengl/grabber/mainwindow.cpp b/examples/opengl/grabber/mainwindow.cpp
index 9f31733856f..9f82ee10bac 100644
--- a/examples/opengl/grabber/mainwindow.cpp
+++ b/examples/opengl/grabber/mainwindow.cpp
@@ -175,7 +175,7 @@ QSlider *MainWindow::createSlider(const char *changedSignal,
 void MainWindow::setPixmap(const QPixmap &pixmap)
 {
     pixmapLabel->setPixmap(pixmap);
-    QSize size = pixmap.size();
+    QSize size = pixmap.size() / pixmap.devicePixelRatio();
     if (size - QSize(1, 0) == pixmapLabelArea->maximumViewportSize())
         size -= QSize(1, 0);
     pixmapLabel->resize(size);
diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index def04706221..72c6e035d93 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -4090,11 +4090,12 @@ QImage QGLWidget::grabFrameBuffer(bool withAlpha)
 {
     makeCurrent();
     QImage res;
-    int w = width();
-    int h = height();
+    qreal pixelRatio = devicePixelRatio();
+    int w = pixelRatio * width();
+    int h = pixelRatio * height();
     if (format().rgba())
         res = qt_gl_read_frame_buffer(QSize(w, h), format().alpha(), withAlpha);
-
+    res.setDevicePixelRatio(pixelRatio);
     return res;
 }