diff --git a/nip04.js b/nip04.js
index 88aab2c..4c0b011 100644
--- a/nip04.js
+++ b/nip04.js
@@ -38,5 +38,5 @@ export function decrypt(privkey, pubkey, ciphertext) {
 function getNormalizedX(key) {
   return typeof key === 'string'
     ? key.substr(2, 64)
-    : Buffer.from(key.slice(1)).toString('hex')
+    : Buffer.from(key.slice(1, 33)).toString('hex')
 }
diff --git a/package.json b/package.json
index 3b4e976..c63fc6b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "nostr-tools",
-  "version": "0.21.3",
+  "version": "0.21.4",
   "description": "Tools for making a Nostr client.",
   "repository": {
     "type": "git",