diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp
index 4e948ed854b..965672fd206 100644
--- a/src/gui/image/qimage.cpp
+++ b/src/gui/image/qimage.cpp
@@ -4921,7 +4921,14 @@ QImage Q_TRACE_INSTRUMENT(qtgui) QImage::transformed(const QTransform &matrix, Q
 
     if (target_format >= QImage::Format_RGB32) {
         // Prevent QPainter from applying devicePixelRatio corrections
-        const QImage sImage = (devicePixelRatio() != 1) ? QImage(constBits(), width(), height(), format()) : *this;
+        QImage sImage = (devicePixelRatio() != 1) ? QImage(constBits(), width(), height(), format()) : *this;
+        if (sImage.d != d
+            && (d->format == QImage::Format_MonoLSB
+             || d->format == QImage::Format_Mono
+             || d->format == QImage::Format_Indexed8)) {
+            sImage.d->colortable = d->colortable;
+            sImage.d->has_alpha_clut = d->has_alpha_clut;
+        }
 
         Q_ASSERT(sImage.devicePixelRatio() == 1);
         Q_ASSERT(sImage.devicePixelRatio() == dImage.devicePixelRatio());
diff --git a/tests/auto/gui/image/qimage/tst_qimage.cpp b/tests/auto/gui/image/qimage/tst_qimage.cpp
index fd155fbf1c2..27eb6e411f2 100644
--- a/tests/auto/gui/image/qimage/tst_qimage.cpp
+++ b/tests/auto/gui/image/qimage/tst_qimage.cpp
@@ -231,6 +231,7 @@ private slots:
     void largeRasterScale();
 
     void metadataChangeWithReadOnlyPixels();
+    void scaleIndexed();
 
 #if defined(Q_OS_WIN)
     void toWinHBITMAP_data();
@@ -4099,6 +4100,16 @@ void tst_QImage::metadataChangeWithReadOnlyPixels()
     QCOMPARE(image.constBits(), (const uchar *)data);
 }
 
+void tst_QImage::scaleIndexed()
+{
+    QImage image(10, 10, QImage::Format_Indexed8);
+    image.setColor(0, qRgb(0,0,0));
+    image.setColor(1, qRgb(1,1,1));
+    image.fill(1);
+    image.setDevicePixelRatio(2);
+    QImage image2 = image.scaled(20, 20, Qt::KeepAspectRatio, Qt::SmoothTransformation); // do not crash
+}
+
 #if defined(Q_OS_WIN)
 
 static inline QColor COLORREFToQColor(COLORREF cr)