diff --git a/README.md b/README.md
index ff3e5ef..c8e97b6 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ The same problem exists but can not be fixed with the ugly hack. If you have a f
 
 ## For Developers
 
-We have overwritten no classes.
+We have overwritten only Mage_Api_Model_User, because we need to replace the new functionality in 1.9.4.4.
 
 We changed the encryption model in global/helpers/core/encryption_model and use a few events to replaces the passwords after login. This is configurable, have a look at the settings.
 
diff --git a/app/code/community/Ikonoshirt/Pbkdf2/Model/Api/User.php b/app/code/community/Ikonoshirt/Pbkdf2/Model/Api/User.php
new file mode 100644
index 0000000..33d6827
--- /dev/null
+++ b/app/code/community/Ikonoshirt/Pbkdf2/Model/Api/User.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+class Ikonoshirt_Pbkdf2_Model_Api_User extends Mage_Api_Model_User
+{
+    protected function _getEncodedApiKey($apiKey)
+    {
+        return Mage::helper('core')->getHash($apiKey);
+    }
+}
diff --git a/app/code/community/Ikonoshirt/Pbkdf2/etc/config.xml b/app/code/community/Ikonoshirt/Pbkdf2/etc/config.xml
index ee57d9a..4ad472f 100644
--- a/app/code/community/Ikonoshirt/Pbkdf2/etc/config.xml
+++ b/app/code/community/Ikonoshirt/Pbkdf2/etc/config.xml
@@ -41,6 +41,11 @@
             <ikonoshirt_pbkdf2>
                 <class>Ikonoshirt_Pbkdf2_Model</class>
             </ikonoshirt_pbkdf2>
+            <api>
+                <rewrite>
+                    <user>Ikonoshirt_Pbkdf2_Model_Api_User</user>
+                </rewrite>
+            </api>
         </models>
         <resources>
             <pbkdf2_setup>
@@ -104,4 +109,3 @@
         </suite>
     </phpunit>
 </config>
-        
\ No newline at end of file