diff --git a/embassy-usb-hid/src/lib.rs b/embassy-usb-hid/src/lib.rs
index e29d485f..996de6a5 100644
--- a/embassy-usb-hid/src/lib.rs
+++ b/embassy-usb-hid/src/lib.rs
@@ -252,6 +252,7 @@ impl<'d, D: Driver<'d>, const N: usize> ReportReader<'d, D, N> {
     /// `read()`. If the dropped future used the same `buf`, then `buf` will
     /// contain the full report.
     pub async fn read(&mut self, buf: &mut [u8]) -> Result<usize, ReadError> {
+        assert!(N != 0);
         assert!(buf.len() >= N);
 
         // Read packets from the endpoint