diff --git a/google/bigtable/v2/bigtable.proto b/google/bigtable/v2/bigtable.proto
index 6c20767d..1ef594ab 100644
--- a/google/bigtable/v2/bigtable.proto
+++ b/google/bigtable/v2/bigtable.proto
@@ -21,6 +21,7 @@ import "google/bigtable/v2/data.proto";
 import "google/protobuf/wrappers.proto";
 import "google/rpc/status.proto";
 
+option csharp_namespace = "Google.Cloud.Bigtable.V2";
 option go_package = "google.golang.org/genproto/googleapis/bigtable/v2;bigtable";
 option java_multiple_files = true;
 option java_outer_classname = "BigtableProto";
diff --git a/google/bigtable/v2/data.proto b/google/bigtable/v2/data.proto
index eadc4a21..3c140803 100644
--- a/google/bigtable/v2/data.proto
+++ b/google/bigtable/v2/data.proto
@@ -16,6 +16,7 @@ syntax = "proto3";
 
 package google.bigtable.v2;
 
+option csharp_namespace = "Google.Cloud.Bigtable.V2";
 option go_package = "google.golang.org/genproto/googleapis/bigtable/v2;bigtable";
 option java_multiple_files = true;
 option java_outer_classname = "DataProto";