diff --git a/flask_simpleldap/__init__.py b/flask_simpleldap/__init__.py
index 5b5cd2a7c5083da6e999e9430740ce2b322a3bda..b0dfc7ba0a2917b03339accc3be1c9408038d56c 100644
--- a/flask_simpleldap/__init__.py
+++ b/flask_simpleldap/__init__.py
@@ -68,7 +68,7 @@ class LDAP(object):
             ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT,
                             ldap.OPT_X_TLS_DEMAND)
             ldap.set_option(ldap.OPT_X_TLS_CACERTFILE,
-                            current_app.config['LDAP_CERT_PATH'])
+                            app.config['LDAP_CERT_PATH'])
 
         for option in ['USERNAME', 'PASSWORD', 'BASE_DN']:
             if app.config['LDAP_{0}'.format(option)] is None: