diff --git a/roles/mail/files/dovecot/move-spam.sieve b/roles/mail/files/dovecot/move-spam.sieve
index fc89619..564d510 100644
--- a/roles/mail/files/dovecot/move-spam.sieve
+++ b/roles/mail/files/dovecot/move-spam.sieve
@@ -1,5 +1,6 @@
-require ["fileinto","mailbox"];
+require ["fileinto", "imap4flags", "mailbox"];
 
 if header :contains "X-Spam" "Yes" {
+ addflag "\\Seen";
  fileinto "Junk";
 }