diff --git a/src/LaunchDarkly/LDUser.php b/src/LaunchDarkly/LDUser.php
index a7181a226..7ddd50bc4 100644
--- a/src/LaunchDarkly/LDUser.php
+++ b/src/LaunchDarkly/LDUser.php
@@ -32,7 +32,7 @@ class LDUser {
      * @param boolean|null $anonymous Whether this is an anonymous user
      * @param array|null   $custom    Other custom attributes that can be used to create custom rules
      */
-    public function __construct($key, $secondary = null, $ip = null, $country = null, $email = null, $name = null, $avatar = null, $firstName = null, $lastName= null, $anonymous = false, $custom = []) {
+    public function __construct($key, $secondary = null, $ip = null, $country = null, $email = null, $name = null, $avatar = null, $firstName = null, $lastName= null, $anonymous = null, $custom = []) {
         $this->_key = $key;
         $this->_secondary = $secondary;
         $this->_ip = $ip;
diff --git a/src/LaunchDarkly/LDUserBuilder.php b/src/LaunchDarkly/LDUserBuilder.php
index a5db8a151..70fefead8 100644
--- a/src/LaunchDarkly/LDUserBuilder.php
+++ b/src/LaunchDarkly/LDUserBuilder.php
@@ -11,7 +11,7 @@ class LDUserBuilder {
     protected $_avatar = null;
     protected $_firstName = null;
     protected $_lastName = null;
-    protected $_anonymous = false;
+    protected $_anonymous = null;
     protected $_custom = [];    
 
     public function __construct($key) {