diff --git a/src/script/hydra-notify b/src/script/hydra-notify
index 1e666bf76..6b053fab2 100755
--- a/src/script/hydra-notify
+++ b/src/script/hydra-notify
@@ -63,6 +63,7 @@ if (defined($promCfg)) {
             host => $promCfg->{"listen_address"},
             port => $promCfg->{"port"},
             timeout => 1,
+            ipv6 => 1,
         );
 
         $server->run($prom->psgi);