diff --git a/cmd/gotenberg/main.go b/cmd/gotenberg/main.go
index 328ad8a9..800a8777 100644
--- a/cmd/gotenberg/main.go
+++ b/cmd/gotenberg/main.go
@@ -18,7 +18,7 @@ import (
 var version = "snapshot"
 
 func main() {
-	const op = "main"
+	const op string = "main"
 	config, err := conf.FromEnv()
 	systemLogger := xlog.New(config.LogLevel(), "system")
 	if err != nil {