diff --git a/internal/version/debug.go b/internal/version/debug.go
index 708057b..a2c3afa 100644
--- a/internal/version/debug.go
+++ b/internal/version/debug.go
@@ -1,7 +1,7 @@
-package version
+//go:build debug
 
-var _debug = false
+package version
 
-func Debug() bool {
-	return _debug
+func init() {
+	_debug = true
 }
diff --git a/internal/version/debug_on.go b/internal/version/debug_on.go
deleted file mode 100644
index a2c3afa..0000000
--- a/internal/version/debug_on.go
+++ /dev/null
@@ -1,7 +0,0 @@
-//go:build debug
-
-package version
-
-func init() {
-	_debug = true
-}
diff --git a/internal/version/version.go b/internal/version/version.go
index 443fae0..3bb92ae 100644
--- a/internal/version/version.go
+++ b/internal/version/version.go
@@ -9,6 +9,8 @@ import (
 const Name = "tun2socks"
 
 var (
+	_debug = false
+
 	// Version can be set at link time by executing
 	// the command: `git describe --abbrev=0 --tags HEAD`
 	Version string
@@ -22,6 +24,10 @@ func versionize(s string) string {
 	return strings.TrimPrefix(s, "v")
 }
 
+func Debug() bool {
+	return _debug
+}
+
 func String() string {
 	if !Debug() {
 		return fmt.Sprintf("%s-%s", Name, versionize(Version))