diff --git a/src/api.rs b/src/api.rs
index 768eb54..a70f373 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -86,7 +86,8 @@ fn write_json_body(res: &mut Response, json_body: impl serde::Serialize) {
 async fn ping(req: &Request, res: &mut Response, depot: &mut Depot) {
     let bot_username = req
         .param::<String>("bot_username")
-        .expect("The path param is required");
+        .expect("The path param is required")
+        .to_lowercase();
     let app_state = depot
         .obtain::<Arc<AppState>>()
         .expect("The app state is injected");