diff --git a/src/URI/Otpauth.php b/src/URI/Otpauth.php
index cd951b9..268b4a2 100644
--- a/src/URI/Otpauth.php
+++ b/src/URI/Otpauth.php
@@ -118,7 +118,7 @@ class Otpauth
     public function emitStr(): string
     {
         $encodeIssuer = \rawurlencode($this->issuer);
-        $label = $encodeIssuer . ":" . $this->userid;
+        $label = $encodeIssuer . ":" . \rawurlencode($this->userid);
         $issuer = "issuer=" . $encodeIssuer;
         $algo = "algorithm=" . $this->algorithm;
         $digits = "digits=" . $this->digits;