diff --git a/app/src/lib.rs b/app/src/lib.rs
index 8544398..3937693 100644
--- a/app/src/lib.rs
+++ b/app/src/lib.rs
@@ -1,4 +1,5 @@
 #![recursion_limit = "256"]
+#![forbid(non_ascii_idents)]
 #![allow(clippy::nonstandard_macro_braces)]
 pub mod components;
 pub mod infra;
diff --git a/auth/src/lib.rs b/auth/src/lib.rs
index e29da83..b59fb75 100644
--- a/auth/src/lib.rs
+++ b/auth/src/lib.rs
@@ -1,3 +1,4 @@
+#![forbid(non_ascii_idents)]
 #![allow(clippy::nonstandard_macro_braces)]
 use chrono::prelude::*;
 use serde::{Deserialize, Serialize};
diff --git a/server/src/main.rs b/server/src/main.rs
index 15f22ae..26cef3a 100644
--- a/server/src/main.rs
+++ b/server/src/main.rs
@@ -1,4 +1,5 @@
 #![forbid(unsafe_code)]
+#![forbid(non_ascii_idents)]
 #![allow(clippy::nonstandard_macro_braces)]
 
 use crate::{