diff --git a/src/packet/public_key.js b/src/packet/public_key.js
index 5010351c..1a37f75d 100644
--- a/src/packet/public_key.js
+++ b/src/packet/public_key.js
@@ -112,7 +112,7 @@ PublicKey.prototype.read = function (bytes) {
 
     return p + 6;
   } else {
-    throw new Error('Version ' + version + ' of the key packet is unsupported.');
+    throw new Error('Version ' + this.version + ' of the key packet is unsupported.');
   }
 };