diff --git a/src/gui/painting/qpdf.cpp b/src/gui/painting/qpdf.cpp
index f44a95ae7c..73117d38fc 100644
--- a/src/gui/painting/qpdf.cpp
+++ b/src/gui/painting/qpdf.cpp
@@ -1436,7 +1436,7 @@ int QPdfEngine::metric(QPaintDevice::PaintDeviceMetric metricType) const
 QPdfEnginePrivate::QPdfEnginePrivate()
     : clipEnabled(false), allClipped(false), hasPen(true), hasBrush(false), simplePen(false),
       needsTransform(false), pdfVersion(QPdfEngine::Version_1_4),
-      colorModel(QPdfEngine::ColorModel::RGB),
+      colorModel(QPdfEngine::ColorModel::Auto),
       outDevice(nullptr), ownsDevice(false),
       embedFonts(true),
       m_pageLayout(QPageSize(QPageSize::A4), QPageLayout::Portrait, QMarginsF(10, 10, 10, 10))
diff --git a/src/gui/painting/qpdfwriter.cpp b/src/gui/painting/qpdfwriter.cpp
index b3b6f3d310..50db7465bd 100644
--- a/src/gui/painting/qpdfwriter.cpp
+++ b/src/gui/painting/qpdfwriter.cpp
@@ -304,7 +304,7 @@ bool QPdfWriter::newPage()
   QPen and QBrush).
 
   \value RGB All colors are converted to RGB and saved as such in the
-  PDF. This is the default.
+  PDF.
 
   \value Grayscale All colors are converted to grayscale. For backwards
   compatibility, they are emitted in the PDF output as RGB colors, with
@@ -314,6 +314,7 @@ bool QPdfWriter::newPage()
 
   \value Auto RGB colors are emitted as RGB; CMYK colors are emitted as
   CMYK. Colors of any other color spec are converted to RGB.
+  This is the default since Qt 6.8.
 
   \sa QColor, QGradient
 */