diff --git a/utils.go b/utils.go
index d401469ebbc9d05522d001d186c147472853933a..729dd30909ad63cdcc153bf1d1c98c40d0f557fc 100644
--- a/utils.go
+++ b/utils.go
@@ -471,7 +471,7 @@ func ReadByteArray(br io.Reader, maxlen uint64) ([]byte, error) {
 	}
 
 	if extra > maxlen {
-		return nil, fmt.Errorf("string in cbor input too long")
+		return nil, fmt.Errorf("string in cbor input too long, maxlen: %d", maxlen)
 	}
 
 	buf := make([]byte, extra)