diff --git a/aspnetcore/grpc/authn-and-authz/sample/Ticketer/Protos/ticket.proto b/aspnetcore/grpc/authn-and-authz/sample/Ticketer/Protos/ticket.proto
index df8cf0f1bb..b986054e01 100644
--- a/aspnetcore/grpc/authn-and-authz/sample/Ticketer/Protos/ticket.proto
+++ b/aspnetcore/grpc/authn-and-authz/sample/Ticketer/Protos/ticket.proto
@@ -1,7 +1,8 @@
 syntax = "proto3";
 
 import "google/protobuf/empty.proto";
-package Ticket;
+
+package ticket;
 
 service Ticketer {
   // Get available ticket count
diff --git a/aspnetcore/grpc/authn-and-authz/sample/TicketerClient/Protos/ticket.proto b/aspnetcore/grpc/authn-and-authz/sample/TicketerClient/Protos/ticket.proto
index df8cf0f1bb..b986054e01 100644
--- a/aspnetcore/grpc/authn-and-authz/sample/TicketerClient/Protos/ticket.proto
+++ b/aspnetcore/grpc/authn-and-authz/sample/TicketerClient/Protos/ticket.proto
@@ -1,7 +1,8 @@
 syntax = "proto3";
 
 import "google/protobuf/empty.proto";
-package Ticket;
+
+package ticket;
 
 service Ticketer {
   // Get available ticket count
diff --git a/aspnetcore/tutorials/grpc/grpc-start/sample/GrpcGreeter/Protos/greet.proto b/aspnetcore/tutorials/grpc/grpc-start/sample/GrpcGreeter/Protos/greet.proto
index 3293d95e8d..02343fa083 100644
--- a/aspnetcore/tutorials/grpc/grpc-start/sample/GrpcGreeter/Protos/greet.proto
+++ b/aspnetcore/tutorials/grpc/grpc-start/sample/GrpcGreeter/Protos/greet.proto
@@ -2,7 +2,7 @@ syntax = "proto3";
 
 option csharp_namespace = "GrpcGreeter";
 
-package Greet;
+package greet;
 
 // The greeting service definition.
 service Greeter {
diff --git a/aspnetcore/tutorials/grpc/grpc-start/sample/GrpcGreeterClient/Protos/greet.proto b/aspnetcore/tutorials/grpc/grpc-start/sample/GrpcGreeterClient/Protos/greet.proto
index 3293d95e8d..02343fa083 100644
--- a/aspnetcore/tutorials/grpc/grpc-start/sample/GrpcGreeterClient/Protos/greet.proto
+++ b/aspnetcore/tutorials/grpc/grpc-start/sample/GrpcGreeterClient/Protos/greet.proto
@@ -2,7 +2,7 @@ syntax = "proto3";
 
 option csharp_namespace = "GrpcGreeter";
 
-package Greet;
+package greet;
 
 // The greeting service definition.
 service Greeter {