diff --git a/tools.go b/tools.go
index 519c21df..709bd378 100644
--- a/tools.go
+++ b/tools.go
@@ -1,10 +1,11 @@
+//go:build tools
 // +build tools
 
 package tools
 
 import (
-    _ "github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway"
-    _ "github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2"
-    _ "google.golang.org/grpc/cmd/protoc-gen-go-grpc"
-    _ "google.golang.org/protobuf/cmd/protoc-gen-go"
+	_ "github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway"
+	_ "github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2"
+	_ "google.golang.org/grpc/cmd/protoc-gen-go-grpc"
+	_ "google.golang.org/protobuf/cmd/protoc-gen-go"
 )