diff --git a/moulinette/authenticators/ldap.py b/moulinette/authenticators/ldap.py
index 2860efd5..5a82a6f0 100644
--- a/moulinette/authenticators/ldap.py
+++ b/moulinette/authenticators/ldap.py
@@ -124,7 +124,7 @@ class Authenticator(BaseAuthenticator):
         if not hashed_password["userPassword"][0].startswith("{CRYPT}$6$"):
             self.update(
                 "cn=%s" % self.adminuser,
-                {"userPassword": _hash_user_password(password)},
+                {"userPassword": [_hash_user_password(password)]},
             )
 
     # Additional LDAP methods
@@ -183,7 +183,7 @@ class Authenticator(BaseAuthenticator):
 
         """
         dn = rdn + "," + self.basedn
-        ldif = modlist.addModlist(self._encode_dict(attr_dict))
+        ldif = modlist.addModlist(attr_dict)
 
         try:
             self.con.add_s(dn, ldif)
@@ -238,9 +238,7 @@ class Authenticator(BaseAuthenticator):
         """
         dn = rdn + "," + self.basedn
         actual_entry = self.search(base=dn, attrs=None)
-        ldif = modlist.modifyModlist(
-            actual_entry[0], self._encode_dict(attr_dict), ignore_oldexistent=1
-        )
+        ldif = modlist.modifyModlist(actual_entry[0], attr_dict, ignore_oldexistent=1)
 
         try:
             if new_rdn:
@@ -307,11 +305,3 @@ class Authenticator(BaseAuthenticator):
 
     def _get_uri(self):
         return self.uri
-
-    def _encode_dict(self, _dict):
-        return {k: self._encode_list(v) for k, v in _dict.items()}
-
-    def _encode_list(self, _list):
-        if not isinstance(_list, list):
-            _list = [_list]
-        return [s.encode("utf-8") for s in _list]
diff --git a/test/src/ldap_server.py b/test/src/ldap_server.py
index 5aa47ab6..710f04a6 100644
--- a/test/src/ldap_server.py
+++ b/test/src/ldap_server.py
@@ -86,19 +86,19 @@ class LDAPServer:
             ldap_interface.add(rdn, attr_dict)
 
         admin_dict = {
-            "cn": "admin",
-            "uid": "admin",
-            "description": "LDAP Administrator",
-            "gidNumber": "1007",
-            "uidNumber": "1007",
-            "homeDirectory": "/home/admin",
-            "loginShell": "/bin/bash",
+            "cn": ["admin"],
+            "uid": ["admin"],
+            "description": ["LDAP Administrator"],
+            "gidNumber": ["1007"],
+            "uidNumber": ["1007"],
+            "homeDirectory": ["/home/admin"],
+            "loginShell": ["/bin/bash"],
             "objectClass": [
                 "organizationalRole",
                 "posixAccount",
                 "simpleSecurityObject",
             ],
-            "userPassword": "yunohost",
+            "userPassword": ["yunohost"],
         }
 
         ldap_interface.update("cn=admin", admin_dict)
diff --git a/test/test_ldap.py b/test/test_ldap.py
index 3710063d..fd1fcb4e 100644
--- a/test/test_ldap.py
+++ b/test/test_ldap.py
@@ -271,8 +271,8 @@ class TestLDAP:
         )
 
         uid = new_user_info["uid"][0]
-        new_user_info["uidNumber"] = "555"
-        new_user_info["gidNumber"] = "555"
+        new_user_info["uidNumber"] = ["555"]
+        new_user_info["gidNumber"] = ["555"]
         new_another_user_uid = "new_another_user"
         if new_rdn:
             new_rdn = "uid=%s" % new_another_user_uid