diff --git a/src/add-ons/mail_daemon/inbound_filters/Jamfile b/src/add-ons/mail_daemon/inbound_filters/Jamfile
index 9642fa88ba..9f6516c12b 100644
--- a/src/add-ons/mail_daemon/inbound_filters/Jamfile
+++ b/src/add-ons/mail_daemon/inbound_filters/Jamfile
@@ -2,4 +2,5 @@ SubDir OBOS_TOP src add-ons mail_daemon inbound_filters ;
 
 SubInclude OBOS_TOP src add-ons mail_daemon inbound_filters r5_filter ;
 SubInclude OBOS_TOP src add-ons mail_daemon inbound_filters match_header ;
+SubInclude OBOS_TOP src add-ons mail_daemon inbound_filters spam_filter ;