diff --git a/lib/protocol.js b/lib/protocol.js
index e91df4a..0ef63ff 100644
--- a/lib/protocol.js
+++ b/lib/protocol.js
@@ -1239,7 +1239,7 @@ function parsePacket(buffer, isServer) {
   var packetInfo = get(packetId, isServer);
   if (packetInfo == null) {
     return {
-      error: new Error("Unrecognized packetId: " + packetId)
+      error: new Error("Unrecognized packetId: " + packetId + " (0x" + packetId.toString(16) + ")")
     }
   }
   var i, fieldInfo, read, readResults;