diff --git a/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/Backends/SOAP.pm b/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/Backends/SOAP.pm
index 2c4dc6f3f..41757867b 100644
--- a/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/Backends/SOAP.pm
+++ b/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/Backends/SOAP.pm
@@ -3,6 +3,7 @@ package Lemonldap::NG::Common::Conf::Backends::SOAP;
 use strict;
 use utf8;
 use SOAP::Lite;
+use Lemonldap::NG::Common::Conf::Constants;
 
 our $VERSION = '2.0.0';