diff --git a/src/plugins/texteditor/basetexteditor.cpp b/src/plugins/texteditor/basetexteditor.cpp
index 3d3ab57530e..d9e2284d64f 100644
--- a/src/plugins/texteditor/basetexteditor.cpp
+++ b/src/plugins/texteditor/basetexteditor.cpp
@@ -2814,7 +2814,7 @@ void BaseTextEditor::paintEvent(QPaintEvent *e)
     qreal lineX = 0;
 
     if (d->m_visibleWrapColumn > 0) {
-        lineX = fontMetrics().averageCharWidth() * d->m_visibleWrapColumn + offset.x() + 4;
+        lineX = QFontMetricsF(font()).averageCharWidth() * d->m_visibleWrapColumn + offset.x() + 4;
 
         if (lineX < viewportRect.width()) {
             const QBrush background = d->m_ifdefedOutFormat.background();