diff --git a/src/python/grpcio_tests/tests/tests.json b/src/python/grpcio_tests/tests/tests.json
index 0eea66da4003955f0a561f06f26ea7bd3075b119..2ac51ac542f80538baf72ec1df0fc7a0efa3bbf2 100644
--- a/src/python/grpcio_tests/tests/tests.json
+++ b/src/python/grpcio_tests/tests/tests.json
@@ -25,7 +25,7 @@
   "_implementations_test.CallCredentialsTest",
   "_implementations_test.ChannelCredentialsTest",
   "_insecure_interop_test.InsecureInteropTest",
-  "_invalid_metadata_test.InvalidMetadataTest"
+  "_invalid_metadata_test.InvalidMetadataTest",
   "_logging_pool_test.LoggingPoolTest",
   "_metadata_code_details_test.MetadataCodeDetailsTest",
   "_metadata_test.MetadataTest",