diff --git a/packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc.py.j2 b/packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc.py.j2
index e906c9d9ea71..1513d353cb8f 100644
--- a/packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc.py.j2
+++ b/packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc.py.j2
@@ -249,6 +249,7 @@ class {{ service.name }}GrpcTransport({{ service.name }}Transport):
                 options=[
                     ("grpc.max_send_message_length", -1),
                     ("grpc.max_receive_message_length", -1),
+                    ("grpc.max_metadata_size", 32768),
                 ],
             )
 
diff --git a/packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc_asyncio.py.j2 b/packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc_asyncio.py.j2
index 7b8a885d227c..4b834616cd8e 100644
--- a/packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc_asyncio.py.j2
+++ b/packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc_asyncio.py.j2
@@ -297,6 +297,7 @@ class {{ service.grpc_asyncio_transport_name }}({{ service.name }}Transport):
                 options=[
                     ("grpc.max_send_message_length", -1),
                     ("grpc.max_receive_message_length", -1),
+                    ("grpc.max_metadata_size", 32768),
                 ],
             )