diff --git a/hypervisor/bsp/include/firmware.h b/hypervisor/bsp/include/firmware.h
index c9a4fe52d..57ec270cd 100644
--- a/hypervisor/bsp/include/firmware.h
+++ b/hypervisor/bsp/include/firmware.h
@@ -8,6 +8,7 @@
 
 #define FIRMWARE_H
 
+struct acrn_vm;
 struct firmware_operations {
 	void (*init)(void);
 	uint64_t (*get_ap_trampoline)(void);