setAxisScale(1) doesn't do anything

[rakkar]

This works fine to update the vertical axis

qwtPlot->setAxisScale(0,yAxisMinSpinBox->value(),yAxisMaxSpinBox->value());
	qwtPlot->replot();

qwtPlot->setAxisScale(0,yAxisMinSpinBox->value(),yAxisMaxSpinBox->value());
	qwtPlot->replot();

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This doesn't do anything

qwtPlot->setAxisScale(1,xAxisMinSpinBox->value(),xAxisMaxSpinBox->value());
	qwtPlot->replot();

qwtPlot->setAxisScale(1,xAxisMinSpinBox->value(),xAxisMaxSpinBox->value());
	qwtPlot->replot();

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Doesn't matter what I pass for xAxisMinSpinBox and xAxisMaxSpinBox for axis 1, just doesn't do anything.

How can I adjust the horizontal axis?