diff --git a/lib/protocol.js b/lib/protocol.js
index c1cfabb..e911ea7 100644
--- a/lib/protocol.js
+++ b/lib/protocol.js
@@ -352,7 +352,7 @@ var packets = {
     { name: "slot", type: "short" },
     { name: "mouseButton", type: "byte" },
     { name: "action", type: "short" },
-    { name: "shift", type: "bool" },
+    { name: "shift", type: "byte" },
     { name: "item", type: "slot" }
   ],
   0x67: [