diff --git a/unipoly-mlmmj-ldap-sync b/unipoly-mlmmj-ldap-sync
index c0c0971..d17c504 100755
--- a/unipoly-mlmmj-ldap-sync
+++ b/unipoly-mlmmj-ldap-sync
@@ -28,7 +28,7 @@ def connect_ldap
   )
 
   ldap_addr = @configuration['ldap']['host'] + ':' +
-              @configuration['ldap']['port']
+              @configuration['ldap']['port'].to_s
   begin
     if conn.bind
       conn