diff --git a/octoprint_auth_ldap/__init__.py b/octoprint_auth_ldap/__init__.py
index b0fbe86..16a730f 100644
--- a/octoprint_auth_ldap/__init__.py
+++ b/octoprint_auth_ldap/__init__.py
@@ -61,9 +61,9 @@ class LDAPUserManager(FilebasedUserManager,
             #connection.bind_s(dn, password)
             #connection.unbind_s()
             
-            data = check_auth(self, username, password)
-
-            for group in ldapify_groups(LDAP_GROUPS):
+            data = self.check_auth(self, username, password)
+    
+            for group in self.ldapify_groups(self,LDAP_GROUPS):
                 if group in data.get('memberOf', []):
                     user = FilebasedUserManager.findUser(self, username)
                     if not user: