diff --git a/src/ruby/bin/interop/interop_client.rb b/src/ruby/bin/interop/interop_client.rb
index 50a14e3a961617cfa855fc2d9b3763d4e38742fc..76402b7c8940f799e86f157071108f588a20cb04 100755
--- a/src/ruby/bin/interop/interop_client.rb
+++ b/src/ruby/bin/interop/interop_client.rb
@@ -56,7 +56,7 @@ require 'test/cpp/interop/empty'
 
 require 'signet/ssl_config'
 
-include Google::RPC::Auth
+include GRPC::Auth
 
 # loads the certificates used to access the test server securely.
 def load_test_certs