diff --git a/tempest/common/generator/base_generator.py b/tempest/common/generator/base_generator.py
index 3a51f2e..0647edb 100644
--- a/tempest/common/generator/base_generator.py
+++ b/tempest/common/generator/base_generator.py
@@ -169,7 +169,7 @@
             expected_result = generator_result[2]
             element = path.pop()
             if len(path) > 0:
-                schema_snip = reduce(dict.get, path, schema)
+                schema_snip = six.moves.reduce(dict.get, path, schema)
                 schema_snip[element] = invalid_snippet
             else:
                 schema[element] = invalid_snippet