diff --git a/gnu/tests/monitoring.scm b/gnu/tests/monitoring.scm
index d20b8ac59e..17b9edc3ac 100644
--- a/gnu/tests/monitoring.scm
+++ b/gnu/tests/monitoring.scm
@@ -307,7 +307,7 @@ (define %zabbix-os
   (let ((base-os
          (simple-operating-system
           (service dhcp-client-service-type)
-          (postgresql-service)
+          (service postgresql-service-type)
           (service zabbix-front-end-service-type
                    (zabbix-front-end-configuration
                     (db-password "zabbix")))