diff --git a/src/gui/image/qppmhandler.cpp b/src/gui/image/qppmhandler.cpp
index e53db69e66..a4689a99f3 100644
--- a/src/gui/image/qppmhandler.cpp
+++ b/src/gui/image/qppmhandler.cpp
@@ -341,7 +341,7 @@ static bool write_pbm_image(QIODevice *out, const QImage &sourceImage, const QBy
             qsizetype bpl = qsizetype(w) * (gray ? 1 : 3);
             uchar *buf = new uchar[bpl];
             if (image.format() == QImage::Format_Indexed8) {
-                QList<QRgb> color = image.colorTable();
+                const QList<QRgb> color = image.colorTable();
                 for (uint y=0; y<h; y++) {
                     const uchar *b = image.constScanLine(y);
                     uchar *p = buf;