diff --git a/measureSequences/qlistmodel.py b/measureSequences/qlistmodel.py
index ce8dede..bf29496 100644
--- a/measureSequences/qlistmodel.py
+++ b/measureSequences/qlistmodel.py
@@ -44,7 +44,7 @@ def headerData(section, orientation, role):
                 return "Sequence"
             return "{}".format(section + 1)
 
-    def rowCount(self):
+    def rowCount(self, parent=QtCore.QModelIndex()):
         return len(self.__sequence)
 
     # def columnCount(self, parent):
@@ -255,7 +255,7 @@ def setData(self, index, value, role=QtCore.Qt.EditRole):
             return True
         return False
 
-    def rowCount(self):
+    def rowCount(self, parent=QtCore.QModelIndex()):
         return len(self.__sequence)
 
     @staticmethod