diff --git a/src/google/adk/tools/bigtable/client.py b/src/google/adk/tools/bigtable/client.py
index 204e2756d9..1d1dd417a9 100644
--- a/src/google/adk/tools/bigtable/client.py
+++ b/src/google/adk/tools/bigtable/client.py
@@ -31,7 +31,7 @@ def _get_client_info() -> google.api_core.client_info.ClientInfo:
 
 def get_bigtable_data_client(
     *, project: str, credentials: Credentials
-) -> bigtable.BigtableDataClient:
+) -> data.BigtableDataClient:
   """Get a Bigtable client."""
 
   bigtable_data_client = data.BigtableDataClient(
diff --git a/tests/unittests/tools/bigtable/test_client.py b/tests/unittests/tools/bigtable/test_client.py
index 533d5ee331..3f48a68874 100644
--- a/tests/unittests/tools/bigtable/test_client.py
+++ b/tests/unittests/tools/bigtable/test_client.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import typing
 from unittest import mock
 
 from google.adk.tools.bigtable import client
 from google.auth.credentials import Credentials
+from google.cloud.bigtable import data
 
 
 def test_get_bigtable_data_client():
@@ -48,3 +50,9 @@ def test_get_bigtable_admin_client():
         credentials=mock_creds,
         client_info=mock.ANY,
     )
+
+
+def test_get_bigtable_data_client_return_annotation_resolves():
+  """The data client return annotation must resolve to a real type."""
+  hints = typing.get_type_hints(client.get_bigtable_data_client)
+  assert hints["return"] is data.BigtableDataClient