diff --git a/widgets/codeeditor.cc b/widgets/codeeditor.cc
index 4fb235496ba839e5aa14a652c893cfcd42382ee2..09e0b358d5e51651209cb4dbc0463bc4a5dfb3fd 100644
--- a/widgets/codeeditor.cc
+++ b/widgets/codeeditor.cc
@@ -71,7 +71,7 @@ int CodeEditorWidget::lineNumberAreaWidth() {
     ++digits;
   }
 
-  int space = 3 + fontMetrics().width(QLatin1Char('9')) * digits;
+  int space = 3 + fontMetrics().horizontalAdvance(QLatin1Char('9')) * digits;
 
   return space;
 }