diff --git a/uniquebible/gui/MainWindow.py b/uniquebible/gui/MainWindow.py
index 3bfdb1b79..6893dd4f3 100755
--- a/uniquebible/gui/MainWindow.py
+++ b/uniquebible/gui/MainWindow.py
@@ -2958,7 +2958,7 @@ def setTabNumberDialog(self):
             config.numberOfTab = integer
             self.handleRestart()
 
-    def setIconButtonSize(self, size=None):
+    def setIconButtonSize(self, size=None, dummy=None):
         if size is None:
             integer, ok = QInputDialog.getInt(self,
                                             "UniqueBible", config.thisTranslation["customiseIconSize"], config.iconButtonSize, 12,