diff --git a/core/admin/mailu/configuration.py b/core/admin/mailu/configuration.py
index 679c6c7e..3d1b4fb5 100644
--- a/core/admin/mailu/configuration.py
+++ b/core/admin/mailu/configuration.py
@@ -140,7 +140,6 @@ class ConfigManager(dict):
         self.config['SESSION_STORAGE_URL'] = 'redis://{0}/3'.format(self.config['REDIS_ADDRESS'])
         self.config['SESSION_COOKIE_SAMESITE'] = 'Strict'
         self.config['SESSION_COOKIE_HTTPONLY'] = True
-        self.config['SESSION_KEY_BITS'] = 128
         self.config['PERMANENT_SESSION_LIFETIME'] = timedelta(hours=int(self.config['SESSION_LIFETIME']))
         # update the app config itself
         app.config = self
diff --git a/core/admin/mailu/utils.py b/core/admin/mailu/utils.py
index 30725ff7..214a9a2d 100644
--- a/core/admin/mailu/utils.py
+++ b/core/admin/mailu/utils.py
@@ -260,9 +260,8 @@ class MailuSessionConfig:
 
         hash_bytes = bits//8 + (bits%8>0)
         time_bytes = 4 # 32 bit timestamp for now
-        shaker = hashlib.shake_256 if bits>128 else hashlib.shake_128
 
-        self._shaker   = shaker(want_bytes(app.config.get('SECRET_KEY', '')))
+        self._shaker   = hashlib.shake_128(want_bytes(app.config.get('SECRET_KEY', '')))
         self._hash_len = hash_bytes
         self._hash_b64 = len(self._encode(bytes(hash_bytes)))
         self._key_min  = 2*self._hash_b64