diff --git a/lib/jkqtfastplotter/jkqtfastplotter.cpp b/lib/jkqtfastplotter/jkqtfastplotter.cpp
index e086518f99..9cb3049255 100644
--- a/lib/jkqtfastplotter/jkqtfastplotter.cpp
+++ b/lib/jkqtfastplotter/jkqtfastplotter.cpp
@@ -1447,7 +1447,11 @@ void JKQTFPQScaleBarXPlot::drawGraph(QPainter& painter) {
         painter.drawLine(QLineF(xx1, yy1, xx2, yy2));
         painter.setFont(font);
         QFontMetrics fm=painter.fontMetrics();
+#if QT_VERSION >= QT_VERSION_CHECK(5,11,0)
         painter.drawText(static_cast<int>(xx1+(xx2-xx1)/2-fm.horizontalAdvance(s)/2), static_cast<int>(yy1+3*lineWidth+fm.ascent()), s);
+#else
+        painter.drawText(static_cast<int>(xx1+(xx2-xx1)/2-fm.width(s)/2), static_cast<int>(yy1+3*lineWidth+fm.ascent()), s);
+#endif
     } else if (position==JKQTFPQScaleBarXPlot::TopLeft) {
         yy1=parent->getInternalPlotBorderTop()+yDistance;
         yy2=yy1;
@@ -1458,7 +1462,11 @@ void JKQTFPQScaleBarXPlot::drawGraph(QPainter& painter) {
         painter.drawLine(QLineF(xx1, yy1, xx2, yy2));
         painter.setFont(font);
         QFontMetrics fm=painter.fontMetrics();
+#if QT_VERSION >= QT_VERSION_CHECK(5,11,0)
         painter.drawText(static_cast<int>(xx1+(xx2-xx1)/2-fm.horizontalAdvance(s)/2), static_cast<int>(yy1+3*lineWidth+fm.ascent()), s);
+#else
+        painter.drawText(static_cast<int>(xx1+(xx2-xx1)/2-fm.width(s)/2), static_cast<int>(yy1+3*lineWidth+fm.ascent()), s);
+#endif
     } else if (position==JKQTFPQScaleBarXPlot::BottomLeft) {
         yy1=parent->getInternalPlotBorderTop()+parent->getPlotHeight()-yDistance;
         yy2=yy1;
@@ -1469,7 +1477,11 @@ void JKQTFPQScaleBarXPlot::drawGraph(QPainter& painter) {
         painter.drawLine(QLineF(xx1, yy1, xx2, yy2));
         painter.setFont(font);
         QFontMetrics fm=painter.fontMetrics();
+#if QT_VERSION >= QT_VERSION_CHECK(5,11,0)
         painter.drawText(static_cast<int>(xx1+(xx2-xx1)/2-fm.horizontalAdvance(s)/2), static_cast<int>(yy1-3*lineWidth-fm.descent()), s);
+#else
+        painter.drawText(static_cast<int>(xx1+(xx2-xx1)/2-fm.width(s)/2), static_cast<int>(yy1-3*lineWidth-fm.descent()), s);
+#endif
     } else if (position==JKQTFPQScaleBarXPlot::BottomRight) {
         yy1=parent->getInternalPlotBorderTop()+parent->getPlotHeight()-yDistance;
         yy2=yy1;
@@ -1480,7 +1492,11 @@ void JKQTFPQScaleBarXPlot::drawGraph(QPainter& painter) {
         painter.drawLine(QLineF(xx1, yy1, xx2, yy2));
         painter.setFont(font);
         QFontMetrics fm=painter.fontMetrics();
+#if QT_VERSION >= QT_VERSION_CHECK(5,11,0)
         painter.drawText(static_cast<int>(xx1+(xx2-xx1)/2-fm.horizontalAdvance(s)/2), static_cast<int>(yy1-3*lineWidth-fm.descent()), s);
+#else
+        painter.drawText(static_cast<int>(xx1+(xx2-xx1)/2-fm.width(s)/2), static_cast<int>(yy1-3*lineWidth-fm.descent()), s);
+#endif
     }