diff --git a/usr.sbin/syslogd/tests/Makefile b/usr.sbin/syslogd/tests/Makefile
--- a/usr.sbin/syslogd/tests/Makefile
+++ b/usr.sbin/syslogd/tests/Makefile
@@ -1,3 +1,5 @@
 ATF_TESTS_SH+=	syslogd_test
+# Several syslogd listening on the same port prevent parallel operation
+TEST_METADATA+=	is_exclusive="true"
 
 .include <bsd.test.mk>