diff --git a/sdks/python/apache_beam/internal/gcp/auth.py b/sdks/python/apache_beam/internal/gcp/auth.py
index 31bc0b88b8ef..66c08b8344cb 100644
--- a/sdks/python/apache_beam/internal/gcp/auth.py
+++ b/sdks/python/apache_beam/internal/gcp/auth.py
@@ -66,7 +66,7 @@ def set_running_in_gce(worker_executing_project):
 
 
 def get_service_credentials(pipeline_options):
-  # type: (PipelineOptions) -> Optional[google.auth.credentials.Credentials]
+  # type: (PipelineOptions) -> Optional[_ApitoolsCredentialsAdapter]
 
   """For internal use only; no backwards-compatibility guarantees.
 
@@ -76,7 +76,7 @@ def get_service_credentials(pipeline_options):
       like impersonated credentials.
 
   Returns:
-    A ``google.auth.credentials.Credentials`` object or None if credentials
+    A ``_ApitoolsCredentialsAdapter`` object or None if credentials
     not found. Returned object is thread-safe.
   """
   return _Credentials.get_service_credentials(pipeline_options)
diff --git a/sdks/python/apache_beam/internal/gcp/auth_test.py b/sdks/python/apache_beam/internal/gcp/auth_test.py
index 98fb828875b9..654d8e815a50 100644
--- a/sdks/python/apache_beam/internal/gcp/auth_test.py
+++ b/sdks/python/apache_beam/internal/gcp/auth_test.py
@@ -26,7 +26,7 @@
 try:
   import google.auth as gauth
 except ImportError:
-  gauth = None
+  gauth = None  # type: ignore
 
 
 class MockLoggingHandler(logging.Handler):