diff --git a/inc/hf/api.h b/inc/hf/api.h
index 4604123..e588575 100644
--- a/inc/hf/api.h
+++ b/inc/hf/api.h
@@ -32,8 +32,6 @@
 				       struct vcpu **next);
 int64_t api_vm_configure(ipaddr_t send, ipaddr_t recv, struct vcpu *current,
 			 struct vcpu **next);
-int64_t api_mailbox_send(uint32_t vm_id, size_t size, bool notify,
-			 struct vcpu *current, struct vcpu **next);
 struct hf_mailbox_receive_return api_mailbox_receive(bool block,
 						     struct vcpu *current,
 						     struct vcpu **next);
@@ -53,3 +51,6 @@
 int64_t api_interrupt_inject(uint32_t target_vm_id, uint32_t target_vcpu_idx,
 			     uint32_t intid, struct vcpu *current,
 			     struct vcpu **next);
+
+int32_t api_spci_msg_send(uint32_t attributes, struct vcpu *current,
+			  struct vcpu **next);