diff --git a/container/memo.go b/container/memo.go
index 2496fa7..6308f94 100644
--- a/container/memo.go
+++ b/container/memo.go
@@ -20,6 +20,7 @@ func NewMemo[T any] (update func () T) Memo[T] {
 func (this *Memo[T]) Value () T {
 	if !this.valid {
 		this.cache = this.update()
+		this.valid = true
 	}
 	return this.cache
 }