diff --git a/hypervisor/arch/x86/guest/vcpu.c b/hypervisor/arch/x86/guest/vcpu.c
index a52f3b4fa9..9eb37b408b 100644
--- a/hypervisor/arch/x86/guest/vcpu.c
+++ b/hypervisor/arch/x86/guest/vcpu.c
@@ -611,7 +611,7 @@ void vcpu_dumpreg(void *data)
 	}
 }
 #else
-void vcpu_dumpreg(__unused struct vcpu *vcpu)
+void vcpu_dumpreg(__unused void *data)
 {
 	return;
 }