diff --git a/usr.sbin/bhyve/spinup_ap.h b/usr.sbin/bhyve/spinup_ap.h
--- a/usr.sbin/bhyve/spinup_ap.h
+++ b/usr.sbin/bhyve/spinup_ap.h
@@ -31,6 +31,6 @@
 #ifndef	_SPINUP_AP_H_
 #define	_SPINUP_AP_H_
 
-int spinup_ap(struct vmctx *ctx, int newcpu, uint64_t rip);
+void spinup_ap(struct vmctx *ctx, int newcpu, uint64_t rip);
 
 #endif
diff --git a/usr.sbin/bhyve/spinup_ap.c b/usr.sbin/bhyve/spinup_ap.c
--- a/usr.sbin/bhyve/spinup_ap.c
+++ b/usr.sbin/bhyve/spinup_ap.c
@@ -76,7 +76,7 @@
 	assert(error == 0);
 }
 
-int
+void
 spinup_ap(struct vmctx *ctx, int newcpu, uint64_t rip)
 {
 	int error;
@@ -104,6 +104,4 @@
 	spinup_ap_realmode(ctx, newcpu, &rip);
 
 	vm_resume_cpu(ctx, newcpu);
-
-	return (newcpu);
 }