diff --git a/conf/modules.conf b/conf/modules.conf
index 6f4e12e2c..4a6f296e5 100644
--- a/conf/modules.conf
+++ b/conf/modules.conf
@@ -148,6 +148,7 @@ rbl {
             rbl = "swl.spamhaus.org";
             ipv6 = true;
             is_whitelist = true;
+            whitelist_exception = "RWL_SPAMHAUS_WL";
             returncodes {
                 RWL_SPAMHAUS_WL_IND = "127.0.2.2";
                 RWL_SPAMHAUS_WL_TRANS = "127.0.2.3";