--- a/babeld.c
+++ b/babeld.c
@@ -60,7 +60,7 @@ int debug = 0;
 
 int link_detect = 0;
 int all_wireless = 0;
-int has_ipv6_subtrees = 0;
+int has_ipv6_subtrees = 1;
 int default_wireless_hello_interval = -1;
 int default_wired_hello_interval = -1;
 int resend_delay = -1;