diff --git a/plugins/radicale_stamm_auth/__init__.py b/plugins/radicale_stamm_auth/__init__.py
index f11b84a..cda5300 100644
--- a/plugins/radicale_stamm_auth/__init__.py
+++ b/plugins/radicale_stamm_auth/__init__.py
@@ -1,7 +1,7 @@
 from radicale.auth import BaseAuth
 import urllib.request
 import json
-
+import hashlib
 
 class Auth(BaseAuth):
     def generate_base_uri(self, endpoint):
@@ -14,7 +14,7 @@ class Auth(BaseAuth):
         if user is None:
             return False
         main_uri = self.generate_base_uri(
-            "/client/check_pw") + "&uuid=" + user + "&password=" + password
+            "/client/check_pw") + "&hashed=true&uuid=" + user + "&password=" + hashlib.sha512(password.encode()).hexdigest()
         req = urllib.request.urlopen(main_uri, data=None)
         jsons = req.read()
         data = json.loads(jsons)