diff --git a/src/gui_qt/nmr/t1_from_tau.py b/src/gui_qt/nmr/t1_from_tau.py
index 00e1f18..97b23a4 100644
--- a/src/gui_qt/nmr/t1_from_tau.py
+++ b/src/gui_qt/nmr/t1_from_tau.py
@@ -199,3 +199,9 @@ class QRelaxCalc(QtWidgets.QDialog, Ui_Dialog):
     def accept(self):
         self.calc_relaxation()
         super().accept()
+
+    @QtCore.pyqtSlot(QtWidgets.QAbstractButton)
+    def on_buttonBox_clicked(self, button: QtWidgets.QAbstractButton):
+        role = self.buttonBox.buttonRole(button)
+        if role == self.buttonBox.ApplyRole:
+            self.calc_relaxation()