diff --git a/net-mail/dovecot/dovecot-2.3.21.1-r1.ebuild b/net-mail/dovecot/dovecot-2.3.21.1-r1.ebuild
index b898de2b49e8..f0bef7aed6ca 100644
--- a/net-mail/dovecot/dovecot-2.3.21.1-r1.ebuild
+++ b/net-mail/dovecot/dovecot-2.3.21.1-r1.ebuild
@@ -30,7 +30,7 @@ SRC_URI="https://dovecot.org/releases/${major_minor}/${rc_dir}${MY_P}.tar.gz
 S="${WORKDIR}/${MY_P}"
 LICENSE="LGPL-2.1 MIT"
 SLOT="0/${PV}"
-KEYWORDS="amd64 arm arm64 ~hppa ~mips ppc ppc64 ~riscv ~sparc x86"
+KEYWORDS="~alpha amd64 arm arm64 ~hppa ~mips ppc ppc64 ~riscv ~s390 ~sparc x86"
 
 IUSE_DOVECOT_AUTH="kerberos ldap lua mysql pam postgres sqlite"
 IUSE_DOVECOT_COMPRESS="lz4 zstd"