diff --git a/peewee.py b/peewee.py
index e19210bff..27b7d2259 100644
--- a/peewee.py
+++ b/peewee.py
@@ -2541,7 +2541,7 @@ def last_insert_id(self, cursor, model):
                 schema, meta.db_table, meta.primary_key.db_column))
             result = cursor.fetchone()[0]
         if self.get_autocommit():
-            self.get_conn().commit()
+            self.commit()
         return result
 
     def get_indexes_for_table(self, table):