diff --git a/cmd/dwelling-upload-clear/main.go b/cmd/dwelling-upload-clear/main.go
index 7d094f2..3e4d152 100644
--- a/cmd/dwelling-upload-clear/main.go
+++ b/cmd/dwelling-upload-clear/main.go
@@ -18,6 +18,26 @@ import (
 var configPath *string = flag.String("conf", "config.yaml", "path to configuration file")
 var logToStdout *bool = flag.Bool("log-stdout", false, "write logs to stdout")
 
+func substituteUser(username string) error {
+	dwu, err := user.Lookup(username)
+	if err != nil {
+		return err
+	}
+
+	dwuid, err := strconv.Atoi(dwu.Uid)
+	if err != nil {
+		return err
+	}
+
+	if os.Getuid() != dwuid {
+		if err := syscall.Setuid(dwuid); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 func main() {
 	flag.Parse()
 
@@ -26,23 +46,10 @@ func main() {
 		log.Fatalln(err)
 	}
 
-	// Substitute user to the one in config
-	dwu, err := user.Lookup(config.User)
-	if err != nil {
+	if err := substituteUser(config.User); err != nil {
 		log.Fatalln(err)
 	}
 
-	dwuid, err := strconv.Atoi(dwu.Uid)
-	if err != nil {
-		log.Fatalln(err)
-	}
-
-	if os.Getuid() != dwuid {
-		if err := syscall.Setuid(dwuid); err != nil {
-			log.Fatalln(err)
-		}
-	}
-
 	if *logToStdout {
 		config.Log.ToStdout = true
 	}