diff --git a/vm/vm-object.c b/vm/vm-object.c
index d720c3c..84b08d2 100644
--- a/vm/vm-object.c
+++ b/vm/vm-object.c
@@ -31,9 +31,10 @@ static kern_status_t vm_object_cleanup(struct object *obj)
 
 	if (vmo->vo_ctrl) {
 		unsigned long flags;
-		vm_controller_lock_irqsave(vmo->vo_ctrl, &flags);
+		struct vm_controller *ctrl = vmo->vo_ctrl;
+		vm_controller_lock_irqsave(ctrl, &flags);
 		vm_controller_detach_object(vmo->vo_ctrl, vmo);
-		vm_controller_unlock_irqrestore(vmo->vo_ctrl, flags);
+		vm_controller_unlock_irqrestore(ctrl, flags);
 	}
 
 	return KERN_OK;