diff --git a/src/Token.php b/src/Token.php
index b2cd038..184648a 100644
--- a/src/Token.php
+++ b/src/Token.php
@@ -26,6 +26,6 @@ public static function decode(string $token = null, string $publicKey)
    */
   private static function buildPublicKey(string $key)
   {
-    return "-----BEGIN PUBLIC KEY-----\n{$key}\n-----END PUBLIC KEY-----";
+    return "-----BEGIN PUBLIC KEY-----\n" . wordwrap($key, 64, "\n", true) . "\n-----END PUBLIC KEY-----";
   }
 }
\ No newline at end of file