diff --git a/package/systemd/systemd.mk b/package/systemd/systemd.mk
index 3223915d40..1f1b5823a2 100644
--- a/package/systemd/systemd.mk
+++ b/package/systemd/systemd.mk
@@ -699,6 +699,7 @@ endef
 
 define SYSTEMD_USERS
 	# udev user groups
+	- - clock -1 * - - - PTP and RTC device group
 	- - render -1 * - - - DRI rendering nodes
 	# systemd user groups
 	- - systemd-journal -1 * - - - Journal