diff --git a/default.nix b/default.nix
index efc82e9..02a0348 100644
--- a/default.nix
+++ b/default.nix
@@ -182,7 +182,7 @@ in
       default = {};
     };
 
-    lmptSaveToDetailMailbox = mkOption {
+    lmtpSaveToDetailMailbox = mkOption {
       type = types.enum ["yes" "no"];
       default = "yes";
       description = ''
diff --git a/mail-server/dovecot.nix b/mail-server/dovecot.nix
index ca05ade..8f500f7 100644
--- a/mail-server/dovecot.nix
+++ b/mail-server/dovecot.nix
@@ -139,7 +139,7 @@ in
         }
 
         recipient_delimiter = +
-        lmtp_save_to_detail_mailbox = ${cfg.lmptSaveToDetailMailbox}
+        lmtp_save_to_detail_mailbox = ${cfg.lmtpSaveToDetailMailbox}
 
         protocol lmtp {
           mail_plugins = $mail_plugins sieve