diff --git a/lib/codec.js b/lib/codec.js
index bb9f5594..9a31e80f 100644
--- a/lib/codec.js
+++ b/lib/codec.js
@@ -300,6 +300,7 @@ function decodeFields(slice) {
         case 'l':
             val = ints.readInt64BE(slice, offset); offset += 8;
             break;
+        case 'U':
         case 's':
             val = slice.readInt16BE(offset); offset += 2;
             break;