diff --git a/cps/cw_login/login_manager.py b/cps/cw_login/login_manager.py
index bf0efbc7..21dc803d 100644
--- a/cps/cw_login/login_manager.py
+++ b/cps/cw_login/login_manager.py
@@ -397,7 +397,7 @@ class LoginManager:
 
     def _load_user_from_remember_cookie(self, cookie):
         signer_kwargs = dict(
-            key_derivation="hmac", digest_method=staticmethod(hashlib.sha1)
+            key_derivation="hmac", digest_method=hashlib.sha1
         )
         try:
             remember_dict = URLSafeSerializer(
@@ -482,7 +482,7 @@ class LoginManager:
         # prepare data
         max_age = int(current_app.permanent_session_lifetime.total_seconds())
         signer_kwargs = dict(
-            key_derivation="hmac", digest_method=staticmethod(hashlib.sha1)
+            key_derivation="hmac", digest_method=hashlib.sha1
         )
         # save
         data = URLSafeSerializer(