diff --git a/nixos/modules/services/mail/dovecot.nix b/nixos/modules/services/mail/dovecot.nix
index 5c332f82b17b..71baa2bb1852 100644
--- a/nixos/modules/services/mail/dovecot.nix
+++ b/nixos/modules/services/mail/dovecot.nix
@@ -14,7 +14,7 @@ let
   baseDir = "/run/dovecot2";
   stateDir = "/var/lib/dovecot";
 
-  sieveScriptSettings = mapAttrs' (to: from: nameValuePair "sieve_${to}" "${stateDir}/sieve/${from}") cfg.sieve.scripts;
+  sieveScriptSettings = mapAttrs' (to: _: nameValuePair "sieve_${to}" "${stateDir}/sieve/${to}") cfg.sieve.scripts;
   imapSieveMailboxSettings = listToAttrs (flatten (imap1 (idx: el:
     singleton {
       name = "imapsieve_mailbox${toString idx}_name";