diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
index 26d121d1d501b..68885a82e7046 100644
--- a/drivers/mailbox/pcc.c
+++ b/drivers/mailbox/pcc.c
@@ -352,4 +352,10 @@ static int __init pcc_init(void)
 
 	return 0;
 }
-device_initcall(pcc_init);
+
+/*
+ * Make PCC init postcore so that users of this mailbox
+ * such as the ACPI Processor driver have it available
+ * at their init.
+ */
+postcore_initcall(pcc_init);