diff --git a/core/chanora_core/src/ptt.rs b/core/chanora_core/src/ptt.rs
index 5779e54..bdf31b3 100644
--- a/core/chanora_core/src/ptt.rs
+++ b/core/chanora_core/src/ptt.rs
@@ -327,7 +327,7 @@ mod tests {
         let _ = desc_rx.borrow_and_update();
         let binding = PttBinding {
             input_class: chanora_audio::PttInputClass::Keyboard,
-            platform_key: "space".to_string(),
+            platform_key: "Space".to_string(),
         };
         let new_desc = controller.set_binding(binding.clone()).await.unwrap();
         assert_eq!(new_desc.backend_id, controller.descriptor().await.backend_id);