diff --git a/embassy-usb/src/builder.rs b/embassy-usb/src/builder.rs
index 8d6d06a6b..9e5aa0574 100644
--- a/embassy-usb/src/builder.rs
+++ b/embassy-usb/src/builder.rs
@@ -8,6 +8,8 @@ use crate::types::{InterfaceNumber, StringIndex};
 use crate::{Handler, Interface, UsbDevice, MAX_INTERFACE_COUNT, STRING_INDEX_CUSTOM_START};
 
 #[derive(Debug, Copy, Clone)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+#[non_exhaustive]
 /// Allows Configuring the Bcd USB version below 2.1
 pub enum BcdUsbVersion {
     Two = 0x0200,