diff --git a/sdks/python/apache_beam/yaml/examples/testing/examples_test.py b/sdks/python/apache_beam/yaml/examples/testing/examples_test.py
index 132037835277..50b4d673be95 100644
--- a/sdks/python/apache_beam/yaml/examples/testing/examples_test.py
+++ b/sdks/python/apache_beam/yaml/examples/testing/examples_test.py
@@ -267,7 +267,7 @@ def _spanner_io_read_test_preprocessor(
             for k, v in config.items() if k.startswith('__')
         }
         transform['config']['elements'] = INPUT_TABLES[(
-            instance, database, table)]
+            str(instance), str(database), str(table))]
 
   return test_spec