diff --git a/protos/protos.d.ts b/protos/protos.d.ts
index 119db3292..8df21aa14 100644
--- a/protos/protos.d.ts
+++ b/protos/protos.d.ts
@@ -1,4 +1,4 @@
-// Copyright 2021 Google LLC
+// Copyright 2022 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/protos/protos.js b/protos/protos.js
index be9873c73..d1e728211 100644
--- a/protos/protos.js
+++ b/protos/protos.js
@@ -1,4 +1,4 @@
-// Copyright 2021 Google LLC
+// Copyright 2022 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/src/partial-result-stream.ts b/src/partial-result-stream.ts
index bf8d96e25..786913d56 100644
--- a/src/partial-result-stream.ts
+++ b/src/partial-result-stream.ts
@@ -157,9 +157,9 @@ export class PartialResultStream extends Transform implements ResultEvents {
    *
    * @param {Error} [err] Optional error to destroy stream with.
    */
-  destroy(err?: Error): void {
+  destroy(err?: Error): this {
     if (this._destroyed) {
-      return;
+      return this;
     }
 
     this._destroyed = true;
@@ -170,6 +170,7 @@ export class PartialResultStream extends Transform implements ResultEvents {
       }
       this.emit('close');
     });
+    return this;
   }
   /**
    * Processes each chunk.