diff --git a/visbrain/gui/sleep/interface/ui_elements/ui_panels.py b/visbrain/gui/sleep/interface/ui_elements/ui_panels.py
index 8278e8a32..e30e8ac73 100644
--- a/visbrain/gui/sleep/interface/ui_elements/ui_panels.py
+++ b/visbrain/gui/sleep/interface/ui_elements/ui_panels.py
@@ -241,16 +241,16 @@ def _fcn_chan_check_and_create_w(self):
             # Add ymin spinbox :
             self._yminSpin[i] = QtWidgets.QDoubleSpinBox(self._PanScrollChan)
             self._yminSpin[i].setDecimals(1)
-            self._yminSpin[i].setMinimum(10. * self['min'][i])
-            self._yminSpin[i].setMaximum(10. * self['max'][i])
+            self._yminSpin[i].setMinimum(-10. * abs(self['min'][i]))
+            self._yminSpin[i].setMaximum(10. * abs(self['max'][i]))
             self._yminSpin[i].setProperty("value", -int(fact * self['std'][i]))
             self._yminSpin[i].setSingleStep(1.)
             self._PanChanLay.addWidget(self._yminSpin[i], i, 3, 1, 1)
             # Add ymax spinbox :
             self._ymaxSpin[i] = QtWidgets.QDoubleSpinBox(self._PanScrollChan)
             self._ymaxSpin[i].setDecimals(1)
-            self._ymaxSpin[i].setMinimum(10. * self['min'][i])
-            self._ymaxSpin[i].setMaximum(10. * self['max'][i])
+            self._ymaxSpin[i].setMinimum(- 10. * abs(self['min'][i]))
+            self._ymaxSpin[i].setMaximum(10. * abs(self['max'][i]))
             self._ymaxSpin[i].setSingleStep(1.)
             self._ymaxSpin[i].setProperty("value", int(fact * self['std'][i]))
             self._PanChanLay.addWidget(self._ymaxSpin[i], i, 4, 1, 1)