diff --git a/src/calibre/gui2/dialogs/metadata_bulk.py b/src/calibre/gui2/dialogs/metadata_bulk.py
index afbf31c9b1..b53060c3d3 100644
--- a/src/calibre/gui2/dialogs/metadata_bulk.py
+++ b/src/calibre/gui2/dialogs/metadata_bulk.py
@@ -53,7 +53,7 @@ class Worker(Thread):
         # All of these just affect the DB, so we can tolerate a total rollback
         for id in self.ids:
             if do_auto_author:
-                x = self.db.author_sort_from_book(id, index_is_id=True, commit=False)
+                x = self.db.author_sort_from_book(id, index_is_id=True)
                 if x:
                     self.db.set_author_sort(id, x, notify=False, commit=False)
 
@@ -76,8 +76,8 @@ class Worker(Thread):
                 self.db.remove_format(id, remove_format, index_is_id=True, notify=False, commit=False)
 
             if do_remove_conv:
-                self.db.delete_conversion_options(id, 'PIPE')
-        self.db.doit.commit()
+                self.db.delete_conversion_options(id, 'PIPE', commit=False)
+        self.db.commit()
 
         for w in self.cc_widgets:
             w.commit(self.ids)
diff --git a/src/calibre/library/database.py b/src/calibre/library/database.py
index 6147101567..28a0de2153 100644
--- a/src/calibre/library/database.py
+++ b/src/calibre/library/database.py
@@ -1080,9 +1080,11 @@ ALTER TABLE books ADD COLUMN isbn TEXT DEFAULT "" COLLATE NOCASE;
             return cPickle.loads(str(data))
         return None
 
-    def delete_conversion_options(self, id, format):
+    def delete_conversion_options(self, id, format, commit=True):
         self.conn.execute('DELETE FROM conversion_options WHERE book=? AND format=?',
                 (id, format.upper()))
+        if commit:
+            self.conn.commit()
 
 
     def add_format(self, index, ext, stream, index_is_id=False):
diff --git a/src/calibre/library/database2.py b/src/calibre/library/database2.py
index b9dc04126f..4e8611c0ef 100644
--- a/src/calibre/library/database2.py
+++ b/src/calibre/library/database2.py
@@ -1451,6 +1451,9 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
         if notify:
             self.notify('metadata', ids)
 
+    def commit(self):
+        self.conn.commit()
+
     def set_tags(self, id, tags, append=False, notify=True, commit=True):
         '''
         @param tags: list of strings