diff --git a/src/job.rs b/src/job.rs
index 95fbf959b..567809414 100644
--- a/src/job.rs
+++ b/src/job.rs
@@ -1079,7 +1079,7 @@ fn suspend_smtp_thread(context: &Context, suspend: bool) {
 
 fn send_mdn(context: &Context, msg: &Message) -> Result<()> {
     let mut param = Params::new();
-    param.set(Param::MessageId, msg.id.to_u32().to_string());
+    param.set(Param::MsgId, msg.id.to_u32().to_string());
 
     job_add(context, Action::SendMdn, msg.from_id as i32, param, 0);
 
diff --git a/src/param.rs b/src/param.rs
index 618d97b52..af265674b 100644
--- a/src/param.rs
+++ b/src/param.rs
@@ -119,7 +119,7 @@ pub enum Param {
     GroupName = b'g',
 
     /// For MDN-sending job
-    MessageId = b'I',
+    MsgId = b'I',
 }
 
 /// Possible values for `Param::ForcePlaintext`.
@@ -317,7 +317,7 @@ impl Params {
     }
 
     pub fn get_msg_id(&self) -> Option<MsgId> {
-        self.get(Param::MessageId)
+        self.get(Param::MsgId)
             .and_then(|x| x.parse::<u32>().ok())
             .map(MsgId::new)
     }