diff --git a/scripts/ldap-rootdse.nse b/scripts/ldap-rootdse.nse
index 6adad7bb5..ffa902a12 100644
--- a/scripts/ldap-rootdse.nse
+++ b/scripts/ldap-rootdse.nse
@@ -3,6 +3,7 @@ local ldap = require "ldap"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
+local string = require "string"
 
 description = [[
 Retrieves the LDAP root DSA-specific Entry (DSE)