Lower-case string
diff --git a/src/python/grpcio_test/grpc_test/_cython/adapter_low_test.py b/src/python/grpcio_test/grpc_test/_cython/adapter_low_test.py
index 9bab930..f1bec23 100644
--- a/src/python/grpcio_test/grpc_test/_cython/adapter_low_test.py
+++ b/src/python/grpcio_test/grpc_test/_cython/adapter_low_test.py
@@ -76,7 +76,7 @@
CLIENT_METADATA_BIN_VALUE = b'\0'*1000
SERVER_INITIAL_METADATA_KEY = 'init_me_me_me'
SERVER_INITIAL_METADATA_VALUE = 'whodawha?'
- SERVER_TRAILING_METADATA_KEY = 'California_is_in_a_drought'
+ SERVER_TRAILING_METADATA_KEY = 'california_is_in_a_drought'
SERVER_TRAILING_METADATA_VALUE = 'zomg it is'
SERVER_STATUS_CODE = _types.StatusCode.OK
SERVER_STATUS_DETAILS = 'our work is never over'