diff --git a/neutron/agent/ovsdb/native/commands.py b/neutron/agent/ovsdb/native/commands.py
index 23c2eae5327..acabc3897aa 100644
--- a/neutron/agent/ovsdb/native/commands.py
+++ b/neutron/agent/ovsdb/native/commands.py
@@ -414,7 +414,7 @@ class DbListCommand(BaseCommand):
 
     def run_idl(self, txn):
         table_schema = self.api._tables[self.table]
-        columns = self.columns or table_schema.columns.keys() + ['_uuid']
+        columns = self.columns or list(table_schema.columns.keys()) + ['_uuid']
         if self.records:
             row_uuids = []
             for record in self.records:
@@ -452,7 +452,7 @@ class DbFindCommand(BaseCommand):
         self.table = self.api._tables[table]
         self.conditions = conditions
         self.columns = (kwargs.get('columns') or
-                        self.table.columns.keys() + ['_uuid'])
+                        list(self.table.columns.keys()) + ['_uuid'])
 
     def run_idl(self, txn):
         self.result = [