diff --git a/utils.go b/utils.go
index 632f8ed1e8d189e79c01ec6a05b08e3371d1c0e6..d401469ebbc9d05522d001d186c147472853933a 100644
--- a/utils.go
+++ b/utils.go
@@ -470,7 +470,7 @@ func ReadByteArray(br io.Reader, maxlen uint64) ([]byte, error) {
 		return nil, fmt.Errorf("expected cbor type 'byte string' in input")
 	}
 
-	if extra > 256*1024 {
+	if extra > maxlen {
 		return nil, fmt.Errorf("string in cbor input too long")
 	}