diff --git a/examples/src/main/proto/greeter.proto b/examples/src/main/proto/hello_world.proto
similarity index 97%
rename from examples/src/main/proto/greeter.proto
rename to examples/src/main/proto/hello_world.proto
index 92a990976d..371a4f6c10 100644
--- a/examples/src/main/proto/greeter.proto
+++ b/examples/src/main/proto/hello_world.proto
@@ -33,6 +33,7 @@ package grpc.example.helloworld;
 
 option java_multiple_files = true;
 option java_package = "io.grpc.examples.helloworld";
+option java_outer_classname = "HelloWorldProto";
 
 // The greeting service definition.
 service Greeter {
diff --git a/examples/src/main/proto/route_guide.proto b/examples/src/main/proto/route_guide.proto
index 44b4ca73c2..377d0d5a02 100644
--- a/examples/src/main/proto/route_guide.proto
+++ b/examples/src/main/proto/route_guide.proto
@@ -33,6 +33,7 @@ package grpc.example.routeguide;
 
 option java_multiple_files = true;
 option java_package = "io.grpc.examples.routeguide";
+option java_outer_classname = "RouteGuideProto";
 
 // Interface exported by the server.
 service RouteGuide {