diff --git a/src/infra/str.rs b/src/infra/str.rs
index 9390e8a..35934f9 100644
--- a/src/infra/str.rs
+++ b/src/infra/str.rs
@@ -1,3 +1,4 @@
+use crate::infra::option::IntoOption;
 use std::ops::ControlFlow;
 use unicode_width::UnicodeWidthChar;