diff --git a/src/calibre/gui2/dialogs/choose_format_device.py b/src/calibre/gui2/dialogs/choose_format_device.py
index d51040ef44..f5e0761e4f 100644
--- a/src/calibre/gui2/dialogs/choose_format_device.py
+++ b/src/calibre/gui2/dialogs/choose_format_device.py
@@ -24,7 +24,7 @@ class ChooseFormatDeviceDialog(QDialog, Ui_ChooseFormatDeviceDialog):
                 self.activated_slot)
 
         self.msg.setText(msg)
-        for i, (format, exists, convertable) in enumerate(formats):
+        for i, (format, exists, convertible) in enumerate(formats):
             t_item = QTreeWidgetItem()
             t_item.setIcon(0, file_icon_provider().icon_from_ext(format.lower()))
             t_item.setText(0, format.upper())