diff --git a/google/cloud/bigquery/logging/v1/audit_data.proto b/google/cloud/bigquery/logging/v1/audit_data.proto
index e74e012ddb..fa2449e5c7 100644
--- a/google/cloud/bigquery/logging/v1/audit_data.proto
+++ b/google/cloud/bigquery/logging/v1/audit_data.proto
@@ -22,6 +22,7 @@ import "google/protobuf/duration.proto";
 import "google/protobuf/timestamp.proto";
 import "google/rpc/status.proto";
 
+option csharp_namespace = "Google.Cloud.BigQuery.Logging.V1";
 option go_package = "cloud.google.com/go/bigquery/logging/apiv1/loggingpb;loggingpb";
 option java_multiple_files = true;
 option java_outer_classname = "AuditDataProto";