diff --git a/qad_graphic/graphic.cpp b/qad_graphic/graphic.cpp
index 244f6b0..29318f0 100644
--- a/qad_graphic/graphic.cpp
+++ b/qad_graphic/graphic.cpp
@@ -853,7 +853,8 @@ void Graphic::drawGrid() {
 	cy = 0;
 	cx = gbx - 5;
 	grid_pen.setWidth(qMax<int>(qRound(thick / 1.4), 1));
-    QFont nf = sf = font();
+    QFont sf = font();
+	QFont nf = sf;
 	sf.setPointSizeF(qMax<qreal>(sf.pointSizeF() / 1.6, 7.));
 	QFontMetrics fm(nf), sfm(sf);
 	if (step > 0.) {