diff --git a/advanced/common/usb/solution-get-descriptor-device.rs b/advanced/common/usb/solution-get-descriptor-device.rs
index 2b168ed..f9fb97b 100644
--- a/advanced/common/usb/solution-get-descriptor-device.rs
+++ b/advanced/common/usb/solution-get-descriptor-device.rs
@@ -90,6 +90,7 @@ impl Request {
                 Err(())
             }
         } else {
+            defmt::println!("unhandled case in `Request` parser");
             Err(())
         }
     }