diff --git a/test/cpp/interop/client.cc b/test/cpp/interop/client.cc
index 8e81e432e7965c45d44dbbdfdae3db6e1d65a9d7..788adefd24b01283892ee5ebe1aec761500cffb7 100644
--- a/test/cpp/interop/client.cc
+++ b/test/cpp/interop/client.cc
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/test/cpp/interop/interop_client.h b/test/cpp/interop/interop_client.h
index 92f57f7bddbcf10cbc468bee42397094f83ac2c2..3f57f3c7336ff3d9d19ac62a40c171c2e063aed0 100644
--- a/test/cpp/interop/interop_client.h
+++ b/test/cpp/interop/interop_client.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/test/cpp/interop/server.cc b/test/cpp/interop/server.cc
index bf576322b40f34f419adc8d7162f6a7c7379a229..63eca6a5ef1e7ecd3bea5b7690c61fe6baf852e7 100644
--- a/test/cpp/interop/server.cc
+++ b/test/cpp/interop/server.cc
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without