diff --git a/meta-phosphor/common/recipes-phosphor/mboxd/files/99-aspeed-mbox.rules b/meta-phosphor/common/recipes-phosphor/mboxd/files/99-aspeed-mbox.rules
index 144fb0f..12e90d8 100644
--- a/meta-phosphor/common/recipes-phosphor/mboxd/files/99-aspeed-mbox.rules
+++ b/meta-phosphor/common/recipes-phosphor/mboxd/files/99-aspeed-mbox.rules
@@ -1 +1 @@
-SUBSYSTEM=="mailbox", TAG+="systemd"
+SUBSYSTEM=="misc", KERNEL=="aspeed-mbox", TAG+="systemd"