diff --git a/src/calibre/gui2/custom_column_widgets.py b/src/calibre/gui2/custom_column_widgets.py
index 52071f925f..2eb5af1eaa 100644
--- a/src/calibre/gui2/custom_column_widgets.py
+++ b/src/calibre/gui2/custom_column_widgets.py
@@ -164,6 +164,7 @@ class Bool(Base):
     def set_to_cleared(self):
         self.combobox.setCurrentIndex(2)
 
+
 class Int(Base):
 
     def setup_ui(self, parent):
@@ -600,6 +601,7 @@ def comments_factory(db, key, parent):
         return LongText(db, key, parent)
     return Comments(db, key, parent)
 
+
 widgets = {
         'bool' : Bool,
         'rating' : Rating,
@@ -1206,5 +1208,3 @@ bulk_widgets = {
         'series': BulkSeries,
         'enumeration': BulkEnumeration,
 }
-
-