diff --git a/src/Gui/SoFCOffscreenRenderer.cpp b/src/Gui/SoFCOffscreenRenderer.cpp
index b237a08800..d4eb3bc1ea 100644
--- a/src/Gui/SoFCOffscreenRenderer.cpp
+++ b/src/Gui/SoFCOffscreenRenderer.cpp
@@ -784,6 +784,8 @@ SoQtOffscreenRenderer::writeToImage (QImage& img) const
         c2.setBlueF(PRIVATE(this)->backgroundopaque[2]);
         c2.setAlphaF(PRIVATE(this)->backgroundopaque[3]);
 
+        QImage image(img.constBits(), img.width(), img.height(), QImage::Format_ARGB32);
+        img = image.copy();
         QRgb rgba = c1.rgba();
         QRgb rgb = c2.rgb();
         QRgb * bits = (QRgb*) img.bits();
diff --git a/src/Gui/View3DInventorViewer.cpp b/src/Gui/View3DInventorViewer.cpp
index 8ac96ebe2b..66f6fc8800 100644
--- a/src/Gui/View3DInventorViewer.cpp
+++ b/src/Gui/View3DInventorViewer.cpp
@@ -1455,6 +1455,8 @@ void View3DInventorViewer::imageFromFramebuffer(int width, int height, int sampl
 
     // if background color isn't opaque manipulate the image
     if (alpha < 255) {
+        QImage image(img.constBits(), img.width(), img.height(), QImage::Format_ARGB32);
+        img = image.copy();
         QRgb rgba = bgcolor.rgba();
         QRgb rgb = bgopaque.rgb();
         QRgb * bits = (QRgb*) img.bits();