diff --git a/apps/servreg-hack/servreg-hack.c b/apps/servreg-hack/servreg-hack.c
index 8ac77276d..8a0165f2c 100644
--- a/apps/servreg-hack/servreg-hack.c
+++ b/apps/servreg-hack/servreg-hack.c
@@ -139,6 +139,8 @@ servreg_hack_register(servreg_hack_id_t id, const uip_ipaddr_t *addr)
      list. If we cannot allocate a service registration, we reuse one
      from the service registrations made by others. */
 
+  servreg_hack_init();
+
   for(t = list_head(own_services);
       t != NULL;
       t = list_item_next(t)) {
@@ -189,6 +191,8 @@ servreg_hack_lookup(servreg_hack_id_t id)
 {
   servreg_hack_item_t *t;
 
+  servreg_hack_init();
+
   purge_registrations();
 
   for(t = servreg_hack_list_head(); t != NULL; t = list_item_next(t)) {