diff --git a/conf/rspamd/rspamd.sieve b/conf/rspamd/rspamd.sieve
index 38943eefa..56a30c3c1 100644
--- a/conf/rspamd/rspamd.sieve
+++ b/conf/rspamd/rspamd.sieve
@@ -1,4 +1,4 @@
 require ["fileinto"];
-if header :is "X-Spam" "yes" {
+if header :is "X-Spam" "Yes" {
     fileinto "Junk";
 }