diff --git a/src/gui/painting/qrasterizer.cpp b/src/gui/painting/qrasterizer.cpp
index 8483a05d60f..a6be7c6c782 100644
--- a/src/gui/painting/qrasterizer.cpp
+++ b/src/gui/painting/qrasterizer.cpp
@@ -891,6 +891,8 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
                 const Q16Dot16 rowHeight = qMin(yFP + Q16Dot16Factor, yPb)
                                            - qMax(yFP, yPa);
                 const int y = Q16Dot16ToInt(yFP);
+                if (y > d->clipRect.bottom())
+                    break;
                 for (int i = 0; i < n; ++i) {
                     buffer.addSpan(x[i], len[i], y,
                                    Q16Dot16ToInt(Q16Dot16Multiply(rowHeight, coverage[i])));