diff --git a/src/gui_qt/data/signaledit/editsignalwidget.py b/src/gui_qt/data/signaledit/editsignalwidget.py
index 73571ea..980ea19 100644
--- a/src/gui_qt/data/signaledit/editsignalwidget.py
+++ b/src/gui_qt/data/signaledit/editsignalwidget.py
@@ -46,7 +46,7 @@ class EditSignalWidget(QtWidgets.QWidget, Ui_Form):
                 stype = 'pts'
             else:
                 try:
-                    _nop = float(self.lineEdit.text())
+                    _nop = float(self.ls_lineEdit.text())
                 except ValueError:
                     _nop = 0.0
                 stype = 'time'