diff --git a/common/errors/errorgen/errorgen.go b/common/errors/errorgen/errorgen.go
deleted file mode 100644
index 36c59baf..00000000
--- a/common/errors/errorgen/errorgen.go
+++ /dev/null
@@ -1 +0,0 @@
-package errorgen
diff --git a/common/errors/errorgen/main.go b/common/errors/errorgen/main.go
index de4cc62d..85dfeb61 100644
--- a/common/errors/errorgen/main.go
+++ b/common/errors/errorgen/main.go
@@ -1,5 +1,3 @@
-// +build generate
-
 package main
 
 import (
diff --git a/common/protocol/protocol.go b/common/protocol/protocol.go
index edf4e5ca..8a7851b2 100644
--- a/common/protocol/protocol.go
+++ b/common/protocol/protocol.go
@@ -1,3 +1,3 @@
 package protocol // import "v2ray.com/core/common/protocol"
 
-//go:generate go run $GOPATH/src/v2ray.com/core/common/errors/errorgen/main.go -pkg protocol -path Protocol
+//go:generate errorgen