diff --git a/packages/google-cloud-service-management/tests/unit/gapic/servicemanagement_v1/test_service_manager.py b/packages/google-cloud-service-management/tests/unit/gapic/servicemanagement_v1/test_service_manager.py
index ae484fb71022..dae55655317a 100644
--- a/packages/google-cloud-service-management/tests/unit/gapic/servicemanagement_v1/test_service_manager.py
+++ b/packages/google-cloud-service-management/tests/unit/gapic/servicemanagement_v1/test_service_manager.py
@@ -13,9 +13,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-import math
 import os
 
+# try/except added for compatibility with python < 3.8
+try:
+    from unittest import mock
+    from unittest.mock import AsyncMock
+except ImportError:
+    import mock
+
+import math
+
 from google.api import auth_pb2  # type: ignore
 from google.api import backend_pb2  # type: ignore
 from google.api import billing_pb2  # type: ignore
@@ -62,7 +70,6 @@
 from google.protobuf import wrappers_pb2  # type: ignore
 import grpc
 from grpc.experimental import aio
-import mock
 from proto.marshal.rules.dates import DurationRule, TimestampRule
 import pytest