diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp
index dc2d936fdae..4aff92ac80d 100644
--- a/src/gui/image/qimage.cpp
+++ b/src/gui/image/qimage.cpp
@@ -3900,10 +3900,15 @@ bool QImage::save(QIODevice* device, const char* format, int quality) const
 bool QImageData::doImageIO(const QImage *image, QImageWriter *writer, int quality) const
 {
     if (quality > 100  || quality < -1)
-        qWarning("QPixmap::save: Quality out of range [-1, 100]");
+        qWarning("QImage::save: Quality out of range [-1, 100]");
     if (quality >= 0)
         writer->setQuality(qMin(quality,100));
-    return writer->write(*image);
+    const bool result = writer->write(*image);
+#ifdef QT_DEBUG
+    if (!result)
+        qWarning("QImage::save: failed to write image - %s", qPrintable(writer->errorString()));
+#endif
+    return result;
 }
 
 /*****************************************************************************