diff --git a/src/main.rs b/src/main.rs
index 75cb407..2c3d277 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -100,7 +100,7 @@ fn main() {
     if args.message_id {
         builder = builder.header(MessageId::from(format!(
             "<{}@{}>",
-            uuid::Uuid::new_v4().to_string(),
+            uuid::Uuid::new_v4(),
             args.from_mail.rsplit_once('@').unwrap().1
         )));
     }