diff --git a/src/proto_uxdg.c b/src/proto_uxdg.c
index 41e01004f..68fe207de 100644
--- a/src/proto_uxdg.c
+++ b/src/proto_uxdg.c
@@ -95,6 +95,7 @@ int uxdg_bind_listener(struct listener *listener, char *errmsg, int errlen)
 
 	if (!(listener->rx.flags & RX_F_BOUND)) {
 		msg = "receiving socket not bound";
+		err |= ERR_FATAL | ERR_ALERT;
 		goto uxdg_return;
 	}
 
diff --git a/src/proto_uxst.c b/src/proto_uxst.c
index c9639e76e..fd22e95bb 100644
--- a/src/proto_uxst.c
+++ b/src/proto_uxst.c
@@ -119,6 +119,7 @@ static int uxst_bind_listener(struct listener *listener, char *errmsg, int errle
 
 	if (!(listener->rx.flags & RX_F_BOUND)) {
 		msg = "receiving socket not bound";
+		err |= ERR_FATAL | ERR_ALERT;
 		goto uxst_return;
 	}