diff --git a/google/cloud/bigtable_v2/services/bigtable/async_client.py b/google/cloud/bigtable_v2/services/bigtable/async_client.py
index d23cf2f32..e497ff25b 100644
--- a/google/cloud/bigtable_v2/services/bigtable/async_client.py
+++ b/google/cloud/bigtable_v2/services/bigtable/async_client.py
@@ -36,14 +36,14 @@
 from google.api_core.client_options import ClientOptions
 from google.api_core import exceptions as core_exceptions
 from google.api_core import gapic_v1
-from google.api_core import retry_async as retries
+from google.api_core import retry as retries
 from google.auth import credentials as ga_credentials  # type: ignore
 from google.oauth2 import service_account  # type: ignore
 
 try:
-    OptionalRetry = Union[retries.AsyncRetry, gapic_v1.method._MethodDefault]
+    OptionalRetry = Union[retries.AsyncRetry, gapic_v1.method._MethodDefault, None]
 except AttributeError:  # pragma: NO COVER
-    OptionalRetry = Union[retries.AsyncRetry, object]  # type: ignore
+    OptionalRetry = Union[retries.AsyncRetry, object, None]  # type: ignore
 
 from google.cloud.bigtable_v2.types import bigtable
 from google.cloud.bigtable_v2.types import data