diff --git a/modules/services/mail/default.nix b/modules/services/mail/default.nix
index 9c279923..0545c483 100644
--- a/modules/services/mail/default.nix
+++ b/modules/services/mail/default.nix
@@ -115,7 +115,7 @@ in
     };
 
     services.dovecot2.sieve = {
-      extensions = [ "+editheader" ];
+      extensions = [ "editheader" ];
       scripts.after2 = pkgs.writeText "custom-spam.sieve" ''
         require ["fileinto", "regex"];