diff --git a/examples/observer/observer.go b/examples/observer/observer.go
index 11a062e..188e41a 100644
--- a/examples/observer/observer.go
+++ b/examples/observer/observer.go
@@ -16,7 +16,7 @@ func (o observer) Register() {
 }
 
 func (o observer) Deregister() {
-	o.vm.Register(o)
+	o.vm.Deregister(o)
 }
 
 func (o observer) OnUpdate(subject string) {