diff --git a/Model/calibration_constant_kt.py b/Model/calibration_constant_kt.py
index d584bf8..692c9d7 100644
--- a/Model/calibration_constant_kt.py
+++ b/Model/calibration_constant_kt.py
@@ -23,7 +23,7 @@ from os import path
 import pandas as pd
 from PyQt5.QtWidgets import (QWidget, QVBoxLayout, QDialog, QTabWidget, QGridLayout, QScrollArea,
                              QFileDialog, QMessageBox, QLabel)
-
+from PyQt5.QtCore import Qt
 
 class CalibrationConstantKt(QDialog):