diff --git a/benchmark/grpc_testing/services.pb.go b/benchmark/grpc_testing/services.pb.go
index 3ce62394..15d08644 100644
--- a/benchmark/grpc_testing/services.pb.go
+++ b/benchmark/grpc_testing/services.pb.go
@@ -24,7 +24,7 @@ var _ grpc.ClientConn
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-const _ = grpc.SupportPackageIsVersion2
+const _ = grpc.SupportPackageIsVersion3
 
 // Client API for BenchmarkService service
 
@@ -161,6 +161,7 @@ var _BenchmarkService_serviceDesc = grpc.ServiceDesc{
 			ClientStreams: true,
 		},
 	},
+	Metadata: fileDescriptor3,
 }
 
 // Client API for WorkerService service
@@ -416,6 +417,7 @@ var _WorkerService_serviceDesc = grpc.ServiceDesc{
 			ClientStreams: true,
 		},
 	},
+	Metadata: fileDescriptor3,
 }
 
 func init() { proto.RegisterFile("services.proto", fileDescriptor3) }
diff --git a/examples/helloworld/helloworld/helloworld.pb.go b/examples/helloworld/helloworld/helloworld.pb.go
index 8527dd3b..0419f6af 100644
--- a/examples/helloworld/helloworld/helloworld.pb.go
+++ b/examples/helloworld/helloworld/helloworld.pb.go
@@ -65,7 +65,7 @@ var _ grpc.ClientConn
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-const _ = grpc.SupportPackageIsVersion2
+const _ = grpc.SupportPackageIsVersion3
 
 // Client API for Greeter service
 
@@ -129,7 +129,8 @@ var _Greeter_serviceDesc = grpc.ServiceDesc{
 			Handler:    _Greeter_SayHello_Handler,
 		},
 	},
-	Streams: []grpc.StreamDesc{},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: fileDescriptor0,
 }
 
 func init() { proto.RegisterFile("helloworld.proto", fileDescriptor0) }
diff --git a/examples/route_guide/routeguide/route_guide.pb.go b/examples/route_guide/routeguide/route_guide.pb.go
index 80efa22b..9bb1d605 100644
--- a/examples/route_guide/routeguide/route_guide.pb.go
+++ b/examples/route_guide/routeguide/route_guide.pb.go
@@ -156,7 +156,7 @@ var _ grpc.ClientConn
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-const _ = grpc.SupportPackageIsVersion2
+const _ = grpc.SupportPackageIsVersion3
 
 // Client API for RouteGuide service
 
@@ -452,6 +452,7 @@ var _RouteGuide_serviceDesc = grpc.ServiceDesc{
 			ClientStreams: true,
 		},
 	},
+	Metadata: fileDescriptor0,
 }
 
 func init() { proto.RegisterFile("route_guide.proto", fileDescriptor0) }
diff --git a/health/grpc_health_v1/health.pb.go b/health/grpc_health_v1/health.pb.go
index 8fb18ea0..0e6a9100 100644
--- a/health/grpc_health_v1/health.pb.go
+++ b/health/grpc_health_v1/health.pb.go
@@ -90,7 +90,7 @@ var _ grpc.ClientConn
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-const _ = grpc.SupportPackageIsVersion2
+const _ = grpc.SupportPackageIsVersion3
 
 // Client API for Health service
 
@@ -152,7 +152,8 @@ var _Health_serviceDesc = grpc.ServiceDesc{
 			Handler:    _Health_Check_Handler,
 		},
 	},
-	Streams: []grpc.StreamDesc{},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: fileDescriptor0,
 }
 
 func init() { proto.RegisterFile("health.proto", fileDescriptor0) }
diff --git a/interop/grpc_testing/test.pb.go b/interop/grpc_testing/test.pb.go
index 17373a43..0ceb12df 100755
--- a/interop/grpc_testing/test.pb.go
+++ b/interop/grpc_testing/test.pb.go
@@ -360,7 +360,7 @@ var _ grpc.ClientConn
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-const _ = grpc.SupportPackageIsVersion2
+const _ = grpc.SupportPackageIsVersion3
 
 // Client API for TestService service
 
@@ -742,6 +742,7 @@ var _TestService_serviceDesc = grpc.ServiceDesc{
 			ClientStreams: true,
 		},
 	},
+	Metadata: fileDescriptor0,
 }
 
 func init() { proto.RegisterFile("test.proto", fileDescriptor0) }
diff --git a/rpc_util.go b/rpc_util.go
index fe3748d9..080ebb14 100644
--- a/rpc_util.go
+++ b/rpc_util.go
@@ -406,10 +406,10 @@ func convertCode(err error) codes.Code {
 	return codes.Unknown
 }
 
-// SupportPackageIsVersion2 is referenced from generated protocol buffer files
+// SupportPackageIsVersion3 is referenced from generated protocol buffer files
 // to assert that that code is compatible with this version of the grpc package.
 //
 // This constant may be renamed in the future if a change in the generated code
 // requires a synchronised update of grpc-go and protoc-gen-go. This constant
 // should not be referenced from any other code.
-const SupportPackageIsVersion2 = true
+const SupportPackageIsVersion3 = true
diff --git a/stress/grpc_testing/metrics.pb.go b/stress/grpc_testing/metrics.pb.go
index 6abe5d30..4ad4ccdb 100644
--- a/stress/grpc_testing/metrics.pb.go
+++ b/stress/grpc_testing/metrics.pb.go
@@ -205,7 +205,7 @@ var _ grpc.ClientConn
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-const _ = grpc.SupportPackageIsVersion2
+const _ = grpc.SupportPackageIsVersion3
 
 // Client API for MetricsService service
 
@@ -335,6 +335,7 @@ var _MetricsService_serviceDesc = grpc.ServiceDesc{
 			ServerStreams: true,
 		},
 	},
+	Metadata: fileDescriptor0,
 }
 
 func init() { proto.RegisterFile("metrics.proto", fileDescriptor0) }
diff --git a/test/grpc_testing/test.pb.go b/test/grpc_testing/test.pb.go
index 17373a43..0ceb12df 100644
--- a/test/grpc_testing/test.pb.go
+++ b/test/grpc_testing/test.pb.go
@@ -360,7 +360,7 @@ var _ grpc.ClientConn
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-const _ = grpc.SupportPackageIsVersion2
+const _ = grpc.SupportPackageIsVersion3
 
 // Client API for TestService service
 
@@ -742,6 +742,7 @@ var _TestService_serviceDesc = grpc.ServiceDesc{
 			ClientStreams: true,
 		},
 	},
+	Metadata: fileDescriptor0,
 }
 
 func init() { proto.RegisterFile("test.proto", fileDescriptor0) }