diff --git a/src/Gui/BitmapFactory.cpp b/src/Gui/BitmapFactory.cpp
index da7a9a9f4..9dac5cd12 100644
--- a/src/Gui/BitmapFactory.cpp
+++ b/src/Gui/BitmapFactory.cpp
@@ -589,7 +589,7 @@ void BitmapFactoryInst::convert(const QImage& p, SoSFImage& img) const
     size[0] = p.width();
     size[1] = p.height();
 
-    int buffersize = p.numBytes();
+    int buffersize = p.byteCount();
     int numcomponents = 0;
     QVector<QRgb> table = p.colorTable();
     if (!table.isEmpty()) {